Marijuana Grow Lights

… which ones work best and where to buy them?

Always remember: Light == Weight!


Further below: Details for all lamp types and where to get them.

When you grow cannabis, you will put your plants initially under 18 hours of light. For the remaining 6 hours they need total darkness.

This 18/6 hours period is called “vegetative stage”. The plant thinks it is spring. It puts its energy into leaf and stem growth. It will not develop buds.

After 2 – 4 weeks of vegetative growth, you are going to switch the light to 12 hours on / 12 hours off. This will make the plant think that it has become middle/late summer. Time to develop buds!

If you have decided to use different light bulbs for vegetative / flowering stage, now is the time to change them.

If you want to avoid stress for your green friends, don’t switch the light radical from 18 hours on to 12 hours. Go 2 or 3 days with 16 hours / 8 hours and 14/10.

Switching on and off is done by a timer. Not manually. Because otherwise one is likely to forget about it.

(Tip: Click the product images to go to eBay and see pricing)

CFL Grow Lights

Easy to use, for an alright harvest with not too much electricity used.

CFL Quick Tips
  • 2700K = Flowering, 6400K = Growth
  • Not as much light as HPS lamps, but easier to use and not as much heat
  • You can mix 2700K + 6400K and use it through whole grow period
  • Keep them close to your plants for best results
  • You could use 1 x 2700K bulb for whole grow (Cheap Micro Setup)
  • 1 x 150Watt is ok for 2 – 4 plants

150 Watt CFL with Reflector


250 Watt CFL + Reflector


T5 Fluorescent Sets



Pic of mature Sticky Icky MarijuanaCFL Lights are relatively inexpensive. They are easy to use, just plug them into a timer and then the outlet.

They don’t produce too much heat and thus don’t require much ventilation.

And yet, they still yield impressive results.

Available in different colors. 6400K for vegetative phase and 2700K for Flowering.

For a very small setup, just one of these in 2700K with a reflector will do for the whole plant life.

You can get good results by using 1 x 2700K and 1x 6400K at the same time.

Pics of Weed grown under CFL Light:

IMG_0284

IMG_0257

HPS or MH Lamps

High Pressure Sodium or Metal Halide bulbs deliver fantastic light for Cannabis.

These are slightly more expensive but deliver a lot more light per Watt.

HPS & MH Quick Tips
  • HPS can safely be used for veg and growth phase
  • MH = Growth phase only
  • These produce more light than CFL
  • Produce heat. Ventilation needed
  • 1 x 400W HPS is good for 6 – 8 Plants

HPS are recommended for beginners. You can use them through the whole plant life.

If you want to do a perfect Job, you could get an additional MH bulb for vegetative stadium.

Complete HPS or MH Set


Cost efficient reflector
in 250 Watt, 400 Watt (best option) or 600 Watt

For better quality get DIGITAL system. Listed here.


These lamps come with a Ballast to run them. Do yourself a favor and get one with a digital ballast. They use less electricity, produce more light and the bulb lives longer. Also, they throw less electro-smog. So the digital ballast is very recommended as opposed to the old dirt magnetic ones which are still being sold every now and then.

Get a 250 Watt for a small setup, 400 Watt for average or 600 or 1000 Watt if you want to go above self supply.

I recommend 400 Watt. It produces lots of weed while not overly stretching the electricity bill.

Pics of Marijuana Grown under 400 Watt HPS:

Bud grown with 400W HPS

400 Watt bud

Delicious Buds

Marijuana Grown under HPS lamps looks a bit more “Professional” than the same grown under CFL It is denser and has more volume.

HPS and MH Lights can be bought on eBay here.

LED Marijuana Grow Lights

Led Grow lights can produce great harvests.

LED Quick Tips
  • These can produce great results with little electricity
  • Produce little heat
  • Fake units very commonly sold. Watch for original brand LEDs (e.g. US made CREE)

They are still expensive, but use very little electricity.

Currently, a lot of people sell these with outrageous claims like :”Replaces 400 W HPS” … or so.

That is most often not true. Especially cheap ones on eBay, they don’t really work.

LEDs have big quality diferences. Additionally, brand names are widely faked.

Genuine CREE LEDs seem to be the best. But, they are often faked. It’s important to check the sellers reputation.

Underneath are links to an eBay seller who seems to produce LED grow lights himself. I trust his lights to be genuine.

Also, I have found a remarkable LED Grow light from an engineer in Holland. His name is Hans and he builds, in my opinion, the worlds best LED Grow light.

It cost as much as 4 large HPS lamps. So it is a bit like a Rolls Royce car. It uses quality LEDs and has a switch to change it from vege to flowering phase.

240W LED Grow Light

Small 100W LED UFO

Big 1546 Watt LED


Pretty Powerful system + UVB
Seems like a quality item.

Hans’ LED Light

Hans LED Grow Light
fantastic quality, switchabe for vege and flower.
Bit difficult to buy from Hans but worth it.
More info


Marijuana grown under  Hans 160 Watt LED Light

Marijuana grown under LED Light

Marijuana Grown under 160 Watt LED Grow Light

LED Grow harvest 3.8 ounces

This grow yielded 3.8 ounces (110 gram) for the price of $15 electricity.

2 LED Grow Panels

2 LED grow panels with 80 Watt each. No big fan required because there is not much heat.

LedGrowPanel hanging with fan

LED Panels are modern, silent, cold, beautiful and energy efficient but expensive on initial purchase.

So which Light is best for me?

If you are on a small budget, or have only little space available, or just want to grow a little weed for yourself: Use CFL Lamps. They are easy to use, inexpensive and produce decent results.

If you have a bit of space available, like a pantry or your garage, you could go for HPS Lamps. They produce big, but you’ll need a fan to get rid of the heat and may also need to filter the smell with a carbon filter. Read more about building a grow box, if you like.

If you are settled and have mastered the game of money. Or if you are generally into new and fine things, try Hans LED panels. You’ll have a silent grow box that uses little electricity and yet produces big yields.

Grow Light in more Detail: Light Color

As mentioned earlier, diferrent light bulbs have diferrent colors.

Plants in vegetation mode need more blue light. MH Lights provide that. MH lights even deliver some red light which makes it possible to use them over the whole plant life.

Flowering plants need more red light, as supplied by HPS lights.

The CFL Lamps are available in red, blue and mixed colors.

Light Color (also called light temperature) is described in Kelvin. 2700 K is a very red spectrum for flowering. 6400 K is a cool blue/green light, as needed for growth. There is also 14.000 K available which has even more blue.

Light Color Temperature Table

Used for Kelvin Color Name Color
Growing around 6400 Daylight, Cool blueish
Flowering around 2700 Warm yellowish – redish

Types of Lamps and their color.

There are High Pressure Lamps, Compact Flouro Lamps and LED Lights available. They all have their strength and weaknesses.

High Pressure Lamps

These are the (still) most commonly used Lamps.

Their brightness and good light color bring great results as Marijuana Grow Lights.

However, they also use a lot of Energy (200 – 600 Watt) and produce a lot of heat. Strong ventilation systems are needed. High Pressure bulbs also need a balast to start them up.

High Pressure Sodium Lights (HPS).

Marijuana Grow Lights

High Pressure Sodium Lights emit an orange/red light. Cannabis needs this during the flowering stage.

Do not use HPS during the vegetative stages of your plants growth.

These Bulbs have a lifespan of ca. 24.000 hours.

High Power Grow lights

Metal Halide Lights (MH).

Marijuana Grow Lights

They send out light in the blue spectrum, which is used in the vegetative (growth) stage of plants.

These bulbs also emit some red. Therefore they can be used for flowering, too. They will yield a good harvest. These bulbs are the best option when you decide to grow under high pressure bulbs.

One disadvantage of MH Lights is their relatively short lifespan of only 10.000 hours.

Compact Fluorescent Lamps (CFL)

Marijuana Grow Lights

A very inexpensive but good option is the use of Compact Fluorescent Lamps (CFL). As shown on the left.

The bulbs are fairly cheap. They do not need a ballast. They run relatively cold

One Lamp with at least 100 Watt will be enough for 1-2 plants. Better use 2 CFLs.

They are available in diferrent colors for vegetative (6400K) and flowering stage (2700K). I had success even with using only one flowering bulb for the whole plant life.

Compact Fluorescent Grow Lights

ctor (except with LED lights) for more efficiency with your Marijuana Grow Lights. Very recommended.

Learn how to build your own Grow Box

  • snake

    hi i have 1.8 sqare foot space and have 6 plans in there.will
    1 Pure Light CFL 150W Bloom 2700K and 1 Pure Light CFL 125W Grow 6400K do my job?

    • http://www.how-to-marijuana.com Jack Tambo

      Hi,

      thanks for the question.

      Yes, 2 CFL Bulbs of that type will work for 6 plants.

      Jack

      • snake

        thanks for reply.one person told me that for each sqare i need at least 1 mh grow lamp 400 w and 1 hps blum 400 w to have result.that means that i have to put 2 of each .please help bacause the cost rises and i need to put different ventilations ,filters,reflectors and transformers thanks for advance.it is a wc and it gets no air inside

  • Stoner James

    great info thanks, now i can’t expend 12 hours of light for autoflowers witch is the minimum hours of light for autoflowers, i saw a video from jorge serventes said that 5 hours of light for regular strains if ok for some fair harvest, give me your opinion

    • http://www.how-to-marijuana.com Jack Tambo

      Hi,

      I doubt it will work.

      Especially for the young plant, 5 hrs is very little.

      Usually flowering is introduced with 12 hr light.

      If JS really said that, ok. Than its worth trying.

      Make sure he ment 5 hrs over the whole grow period. Or was it just for the flowering period?

  • caanabis420

    We have been making our own weeds and seeds for 8 years, and we are in our 7th year of producing top shelf seeds for the

    public. These are all regular weeds and seeds (about 60% will be females).

    Blackberry Diesel (indica)

    Does very well inside and outside, producing lots of large fat, rock hard buds loaded with trichromes and a blackberry

    fragrance. Flowering period is 8-9 weeks.

    Grape Afghan Kush (sativa hybrid)

    This has been crossed with Grape 48 so it will provide big fat very frosty buds with a wild grape-Afghan smell. Average

    indoor yield is 2 oz. per plant. Flowering period is a lengthy 9 to 10 weeks.

    Pauls Purple Fire (indica hybrid) OUT OF STOCK

    This is one of my best strains. Purple Fire (SFV OG Kush x Grape Ape) crossed with AK-48 and then crossed with original

    Grape 48. If you like fat, hardball buds similar to GDP, you will love this strain. Flowering period is 8 to 9 weeks.

    NEW Grape 48 (Indica hybrid) OUT OF STOCK

    One of my best strains. This strain will make you very happy. Grape 48 is Seedsman Purple Bud crossed with Nirvana AK-48

    and now crossed with Purple Kush for density. It will produce monster-sized very dense buds covered in trichromes and with

    a loud grape smell like Grape Ape. Flowering period is 8-9 weeks.

    Original Grape 48 (Sativa hybrid) – OUT OF STOCK

    The original strain without the genetics of Purple Kush (Nirvana AK48 x Seedsman Purple Bud). The big sativa buds are a

    little fluffy and extremely frosty. The strong grape aroma of the Seedsman Purple Bud really comes through.

    Trainwreck (Sativa hybrid) – OUT OF STOCK — MORE COMING SOON!

    This particular strain of Trainwreck came from a clone and was crossed with an AK47 male. The smell from the bud is

    awesome and so is the taste. She will produce lots of big thick sticky purple colas. Trainwreck is a heavy yielder. This

    is a great night time sleepy time high.

    Purple Wreck (Indica hybrid) – OUT OF STOCK — MORE COMING SOON!

    Purple Wreck from Reserva Privada is Trainwreck crossed with Purple Erkle. Another great top shelf strain – very frosty,

    very stinky and very dense buds make it an excellent medcinal choice.

    Call/text……….… (518 444 2976)
    Call/text….……… (518 444 2976)
    Email (mallytree420@yahoo.com)
    ___________________________________________________

    Other strains available:

    Blue Cheese (Blueberry x UK Cheese) LIMITED SUPPLY

    Blueberry OG Kush (Blueberry x Tahoe OG Kush) – OUT OF STOCK

    Blue Tahoe Cheese (Blue Cheese x Blueberry Tahoe OG) – LIMITED SUPPLY

    Playboy OG Kush (indica) [ LIMITED SUPPLY ]

    Purple Berry Playboy (Purple Berry xPlayboy OG) -NEW!

    Lemon Skunk -NEW!

    Early Skunk – NEW!

    WE HAVE 4 BRAND NEW TOP SHELF STRAINS COMING OUT IN THE NEXT 2 WEEKS INCLUDING:

    BLUE CRUSH (BLUEBERRY OG x GIRL SCOUT COOKIES)
    BLUEBERRY OG WRECK
    BLUEBERRY OG GDP
    BLACK N BLUE (BLUEBERRY OG x BLACKBERRY DEISEL)

    ___________________________________________________

    $1.00 each (min order 25) 500 or more – GET 25 FREE SEEDS WITH EVERY 500 SEEDS ORDERED!

    Willing to trade for other seeds or meds. No clones.

    Call/text……….… (518 444 2976)
    Call/text….……… (518 444 2976)

  • caanabis420

    We have been making our own weeds and seeds for 8 years, and we are in our 7th year of producing top shelf seeds for the

    public. These are all regular weeds and seeds (about 60% will be females).

    Blackberry Diesel (indica)

    Does very well inside and outside, producing lots of large fat, rock hard buds loaded with trichromes and a blackberry

    fragrance. Flowering period is 8-9 weeks.

    Grape Afghan Kush (sativa hybrid)

    This has been crossed with Grape 48 so it will provide big fat very frosty buds with a wild grape-Afghan smell. Average

    indoor yield is 2 oz. per plant. Flowering period is a lengthy 9 to 10 weeks.

    Pauls Purple Fire (indica hybrid) OUT OF STOCK

    This is one of my best strains. Purple Fire (SFV OG Kush x Grape Ape) crossed with AK-48 and then crossed with original

    Grape 48. If you like fat, hardball buds similar to GDP, you will love this strain. Flowering period is 8 to 9 weeks.

    NEW Grape 48 (Indica hybrid) OUT OF STOCK

    One of my best strains. This strain will make you very happy. Grape 48 is Seedsman Purple Bud crossed with Nirvana AK-48

    and now crossed with Purple Kush for density. It will produce monster-sized very dense buds covered in trichromes and with

    a loud grape smell like Grape Ape. Flowering period is 8-9 weeks.

    Original Grape 48 (Sativa hybrid) – OUT OF STOCK

    The original strain without the genetics of Purple Kush (Nirvana AK48 x Seedsman Purple Bud). The big sativa buds are a

    little fluffy and extremely frosty. The strong grape aroma of the Seedsman Purple Bud really comes through.

    Trainwreck (Sativa hybrid) – OUT OF STOCK — MORE COMING SOON!

    This particular strain of Trainwreck came from a clone and was crossed with an AK47 male. The smell from the bud is

    awesome and so is the taste. She will produce lots of big thick sticky purple colas. Trainwreck is a heavy yielder. This

    is a great night time sleepy time high.

    Purple Wreck (Indica hybrid) – OUT OF STOCK — MORE COMING SOON!

    Purple Wreck from Reserva Privada is Trainwreck crossed with Purple Erkle. Another great top shelf strain – very frosty,

    very stinky and very dense buds make it an excellent medcinal choice.

    Call/text……….… (518 444 2976)
    Call/text….……… (518 444 2976)
    Email (mallytree420@yahoo.com)
    ___________________________________________________

    Other strains available:

    Blue Cheese (Blueberry x UK Cheese) LIMITED SUPPLY

    Blueberry OG Kush (Blueberry x Tahoe OG Kush) – OUT OF STOCK

    Blue Tahoe Cheese (Blue Cheese x Blueberry Tahoe OG) – LIMITED SUPPLY

    Playboy OG Kush (indica) [ LIMITED SUPPLY ]

    Purple Berry Playboy (Purple Berry xPlayboy OG) -NEW!

    Lemon Skunk -NEW!

    Early Skunk – NEW!

    WE HAVE 4 BRAND NEW TOP SHELF STRAINS COMING OUT IN THE NEXT 2 WEEKS INCLUDING:

    BLUE CRUSH (BLUEBERRY OG x GIRL SCOUT COOKIES)
    BLUEBERRY OG WRECK
    BLUEBERRY OG GDP
    BLACK N BLUE (BLUEBERRY OG x BLACKBERRY DEISEL)

    ___________________________________________________

    $1.00 each (min order 25) 500 or more – GET 25 FREE SEEDS WITH EVERY 500 SEEDS ORDERED!

    Willing to trade for other seeds or meds. No clones.

    /text……….… (518 444 2976)
    /text….……… (518 444 2976)
    /Email (mallytree420@yahoo.com)

    Call/text……….… (518 444 2976)
    Call/text….……… (518 444 2976)jmjmjjmmjjmjmmjmjmjmjmjmmj

  • Seed Grower

    It’s my first auto grow any helpful hints before I get started

    • Jack Tambo

      Nope, I have none yet :-) . Hope your grow goes well.

    • Nancy

      Yes. Buy or borrow my book “The Autoflower Experience” at Amazon/Kindle. I worked with autoflowers exclusively for over three years then wrote this guide book when I was unemployed. It was aimed at caregivers with limited space and time to grow meds for their clients but it will provide some good info for even seasoned growers who want to try autoflowering cannabis.

  • kyle

    Can you tell me what am doing wrong plant don’t seem like ther
    Growing what can I do. Please hdlk me

    Photo: http://www.how-to-marijuana.com/marijuana-grow-lights.html/img_20150424_031215_603

    • Jack Tambo

      Hi,

      thanks for the question.

      They don’t have enough light, Your lamp is wrong and too far away from the plants.

      Cheers, Jack

  • curious

    How do you keep the smell down? I live in a house my neighbors are about 800 ft away but if someone comes over I don’t want them to know. I just started using 150 watt on them today

  • MikeT.

    I am new at this, how close should my led G8 light be to the top of the plant?
    the info that came with the light said to have them between 16 and 24 inches away from the canopy.
    a few plants are long and weak stemmed.

    • Jack Tambo

      Hi,
      long weak stems are a sign of too little light.

      That manual that came with your light was probably for ‘normal’ house plants.

      Cannabis needs lots of light.

      So hang the light as close to the plants as possible without it burning the leaves.

  • Bristol Pete

    Hi, firstly good article :-)
    Please could you advise how many plants/what plants produced the 110 g yield under l.e.d. in your picture?

    Thinking of doing things as efficiently as posssible in a small bike shed. L.e.d lights (good quality) and autoflower seeds. What do you think? Appreciate your help.
    best wishes
    BP

    • Jack Tambo

      Hi,

      thanks for your question!

      It was 10 plants. I do not know what strain produced these. They were grown by Hans himself, the dutch maker of these LED lamps.

      This is web his address. http://www.ledgrow.eu?HANSYOUNEEDTOPAYME
      There is a more detailed description of his grow. Check it out if you like.

      LED lamps are as efficient as it gets. Good ones deliver heaps of light and very little heat. So you don’t need as much ventilation.
      And they are not heavy on the electricity Bill. And these ones from Hans are comparable with HPS lamps. (Most cheapish LED lights from eBay are not.)

      And even though Hans still does not give me any commission, I still can only recommend his lamps. I have not yet found anything better.
      (If you read this Hans, pls get in touch ..)

      All the best for the shed grow. Send some pictures if you like.

      Cheers,

      Jack

  • datu

    hi
    I bought a grow tent (32.20.62) and I’m interested which light will be better.
    250watt CFL or 400watt HPS?

    • datu

      or 250 watt HPS will be enough?

    • Jack Tambo

      Hi,

      thanks for the question

      More Light == More weight.

      The more light you have, the more you’ll harvest.

      If you habe goos strong ventilation, get 400.

      Otherwise, 250 will do just fine

  • pat

    hi, my ac got unpluged overnight and my grow tent for my mothers got super hot, way over 100 degrees and al the plants wilted. all the leaves wilted and drooped but the branches did not. are the plants no good anymore or atleast not what they were before the stress?

    • Jack Tambo

      You can only wait to see what happens.
      They might recover and still be fine.
      You would know after a few days.
      Jack

  • Anonymous

    How many plants will a 400w hps light heat

    • Jack Tambo

      Around 8.
      If the plants are in pots with soil.

      Remember If you start a grow with seeds, remember to start more than 8 plants because some will be males. Unless you have feminized seeds.

  • Charles

    Will one 200 watt cfl light flower one plant in a 2ft24in grow tent

    • Jack Tambo

      Hi,

      the light is strong enough for even 2 plants. (Make sure it’s a 2700K, warmwhite, for flowering)

      If the grow tent is 2 feet high, than it is much too small.

      The plant will touch the light in no time and you need to bend it down and it causes all kinds of troubles.

      You would need a taller grow tent.

      Cheers

  • The only way

    Hi, 1st question. My plants are only a week old, can I leave outside till the flowering stage then bring them indoors, as I worried about frost later.
    2nd question, the picture – how many plants is that setup good for.
    Thanks in advance

    • Jack Tambo

      Hello,

      you can leave them outside. But its risky, they are very fragile when this young. Also animals love eating them.
      Better would be sunny window.

      That set, looks like it has 1 reflector and 2 CFL bulbs.

      So you would run 1 cfl + 1 LED at the same time.

      That works for 4 – 6 plants.

      Cheers

      • Jim the man

        I am a first time grower. I am stuck on what light to purchase is there any way you can explain to me if HPS light will work for veggie and flowering stage?

        • Jack Tambo

          HPS will work for the whole grow.

          MH work only for the first phase, growth phase.

          You will make your plant a bit happier if you get an MH Bulb for growth and HPS for flowering.

          Considering the additional MH bulb costs just 15$, it is worth it. Or just HPS will do fine.

  • William S

    Hey,

    I’m doing a grow box inside a wheelie bin with a LED 40w with 3w chip, will that be enough? Also the lid will be closed stopping air movement, will that effect the plant in terms of air ventilation?

    • Jack Tambo

      Hi,

      a 40W LED may be enough for a small harvest. It depends also a lot on the quality of that LED lamp, they differ a lot. It is worth trying.

      You cannot grow in a closed bin, the plants will suffocate. You need to get a least some fresh air circulation going.

  • brandon

    will a 1x250w cfl 2700k and a 1x250w cfl 6400 get the job done well?

    • Jack Tambo

      Yes, that will work well.

  • MikeT.

    I’m a beginner, do autoflower, fem. seeds need same light requirement, since they don’t depend on light to flower?

    • Jack Tambo

      Hi,
      yes they have the same requirements.

      They might don’t depend (as much) on light duration, but they still need the same colours. More reddish when it’s time to flower.

      • adam

        hi im running a 400 watt cool tube mh bulb for veg and hps for flowering my veg is on a 18/6 light time and my flowering is 12/12 for light time my tent is 40cm diagonally by 40cm across
        ph level 5.3 at the min in veg stage i have to carbon filter one in my tent pulling throw my cooltube and the over one at the back of my tent pulling out the air no smells at all not even in flowering stage but when you open the door it sticks is my set up good comment please

        • Jack Tambo

          Hi,

          thank you for your question.

          You got good equipment. 400W is great and you even have an MH Bulb for veg.

          Your tent seems a bit small. 40cm wide and 40cm across, is that correct? How’d you get the fan and filter in there?

          Anyway, you could make that bigger, (if you have space). With that 400W you can go 1m x 1m easily.

          Good that you have a cool tube, so the light can be rather close to the plants.

          PH 5.3 is a bit low. Have you considered upping it to 6 to 6.5? They will take on nutrients better.

          Congrats to your equipment. 400W + Cool tube + Carbon filter is a very good setup.

          Cheers, Jack

    • Anonymous

      Might want to change the ballast though mate

  • micah

    I upgraded my light I had a 150 watt HPS and now have a 400watt HPS will this harm my plants by switching to the stronger light half way threw flowering?

    • Jack Tambo

      No, they’ll like it. Maybe they will need a bit more water.

      • Anonymous

        awesome thank you

  • Mads

    Hi! really beginning to appreciate this site man.
    I’m a beginner.
    It’s a two part question (hehe): I ill grow in my living room where the sunlight will touch the plants during a good part of the day but i will still use 400 w hps without grow tent. That way i will get them a lot of fresh air and light.
    Am i good with this setup ??
    Can i use 400 w hps during ALL stages ?

    Cheers!

    • Jack Tambo

      Hi,

      that setup will work. 400Watt HPS will do well during all stages.
      Fresh air is good.

      But the 400W HPS will be bright. Very bright. Chances are people will notice from outside.
      Especially in the first 3 weeks where it’s on 18hrs, at nighttime people might wonder what is going on in your house. (unless you have no neighbours).

      Once the ladies start flowering, your house will smell like weed. That’s nice, I know. But again, your neighbours or house guests will notice.

      Otherwise, that setup will work.

      Cheera

    • Mads

      Perfect!
      I’ll hang dark curtains on my window +
      I live in Guatemala in an apartment surrounded by old mayan people – they won’t now wtf is going on :)

      I appreciate the fast answer!!

      Cheers

    • Anonymous

      Will a 400w led light be big enough for a 4 x 4 grow tent?

      • Jack Tambo

        Yes, that is fine

  • Anonymous

    can you mix a veg bulb with flowering when they go to a 12 hours light 12 hours sleep ?

    • Jack Tambo

      yes, no problem

  • Jack Dexter

    I can’t access the hans led lights site, is there an alternative led light system or do you know another way I may be able to procure his product?

    • Jack Tambo

      well there are plenty led systems.
      It’s just that I think hans’ is the best one.
      i checked the site and it works. ledgrow.eu.
      then click the little red link to purchase. He takes payment via paypal

      • Jack Dexter

        Hmm, I still can’t access the link. Maybe it’s my location. Does he have a public e-mail contact that you could provide, I’d truly appreciate it (:

        • Jack Tambo

          he has got another website here http://www.bonsaihero.com/index.php/ledgrow-led-panel-80-w
          and his email: info at ledgrow (dot) eu. Say how-to-marijuana sent you, If you like.

        • Jack Tambo

          nice dog

          • Jack Dexter

            Thanks, I appreciate your correspondence. So his email is bonsaihero@ledgrow.eu? I still can’t access even the alternate site. No clue why it’s being difficult, but either way I persist because I found this blog highly informative and I’ll take your word for it that Hans’ lights are one of the best. Thanks again!

  • A.R.A

    Hi I like to khow for flowering stag how manyplanet with 1Hps400W thanks

    • Jack Tambo

      6 – 8

  • Joe

    Hey so should I do like 2 6400k and 1 2700k for flowering and then do 2 2700k and 1 6400k for buding or should I just do 2 and 2 threw out its whole life?

    • Jack Tambo

      2 + 2 through the entire life will give you the biggest yield.

  • Anonymous

    Which light would be the best throughout the entire cycle of the plant?

    • Jack Tambo

      2700K CFL for small setup or HPS for bigger setup

  • Turkish

    Hi,
    Firstly, thanks for this article.
    I bought 4 x 26 watt (6400k) cfls for autoflower critical jack. I will grow one seed. Must i change 6400k to 2700k in flowering stage ?

    • Jack Tambo

      Hi. You don’t have to. You will be able to harvest even with only 6400K.
      But you will have a bigger harvest if you do. You could at least buy 2 2700K and mix them with the 2 6400. For happy plants.

  • John

    Thinking 4′ x 4′ tent. Would 1 400 watt hps be enough or would I need two lamps for this size?

    • Jack Tambo

      400 Watt would be ok, but you could go 600 Watt to get a bit more.

      • salem

        Hi
        I have veg 5 days old and u mix it the time , I left them on dark place just 3hour
        Is it OK ???

        • Jack Tambo

          Hi,
          3 hours dark for veg is ok.
          6 hours would be better.

          • tim

            im thinkin bout swiching my t5 to led t8 to flower. has anyone tried this before?

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