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Will my lights hurt my yield?

ChenBenTz

Member
I have 1000w HPS in a 2.5x1.5m space.

I'm ScroGing three plants and they're taking the whole space.

Will I see high yields if I add another 600w?

Thanks.
 

vostok

Active member
Veteran
Plants never get enough light ...like humans with cash ..never never enough!

better for you to consider 2 x 600, that way you may encourage 'the great Dutch lean' a site to behold, use 1x 600 am and the other pm, see the plant morph back and forth ...saves bulk cash ...did I say its fun?
 

stoned-trout

if it smells like fish
Veteran
2,600s rock...I wont use a 1k on a scrog..you don't need the penetration...2 600s is only a bit more juice and a lot better
 

siftedunity

cant re Member
Veteran
2,600s rock...I wont use a 1k on a scrog..you don't need the penetration...2 600s is only a bit more juice and a lot better

I scrog with 1k purely for yield. a 600w yields less, both lights don't really penetrate much (if at all) below the scrog. but yes I do agree you get better penetration around the edges etc.
 

ChenBenTz

Member
Are you guys suggesting that 2x 600w is a lot better than 1x 1000w?

How? It's only 200w more light.

So, everyone agrees that 1,200w of light is enough for 2.5mx1.5?
 

frankenstein2

Astronaut Status
Veteran
2 600 are better than a single 1000. 2 points of light source, more lumens, more coverage, closer to plants. Your space needs about 2000 watts to be at the recommended level of watts per square ft.(50 watts per sq. ft. min.). I have a space that size and I have 2000 watts over it, and more than likely will be 2600 before winters over.
 

Jhhnn

Active member
Veteran
Agreed with f2, for the most part. 50-70 watts/ sq.ft. seems to be the sweet spot. Less affects yield adversely & more makes temp control a serious issue. 40 watts/ sq.ft. appears to be the minimum for good results.

Most of that's from observation rather than experience. What I'm sure of is that 1000w in a 4'x4' space works quite well.
 

stoned-trout

if it smells like fish
Veteran
yes I am saying 2 600s is better than 1k...I have both 1k lights and 600s...2 600s in my test tent outperformed a 1k in my tent...your milage may vary
 

Former Guest

Active member
Are you guys suggesting that 2x 600w is a lot better than 1x 1000w?

How? It's only 200w more light.

So, everyone agrees that 1,200w of light is enough for 2.5mx1.5?

i think you should read more about lumen to watt ratios. i'll try to explain it but it's something you should look up none the less if you're interested in this sort of thing. the 600 watt lights will produce more lumens per watt so even though it's only 600 watts it will have 88000 lumens while a 1000 watt will have 130000 if you compare the hortilux super hps bulbs. using a 600 give you 6 more lumens per watt for the same price of electricity. it's only 3600 lumens per 600 watt bulb difference but when you're paying for electricity, it's nice. plus all the other stuff they said about light distribution. it's what i wish i did before i bought my stuff.
 

ChenBenTz

Member
Agreed with f2, for the most part. 50-70 watts/ sq.ft. seems to be the sweet spot. Less affects yield adversely & more makes temp control a serious issue. 40 watts/ sq.ft. appears to be the minimum for good results.

Most of that's from observation rather than experience. What I'm sure of is that 1000w in a 4'x4' space works quite well.

Wow, that's crazy.

70w per square foot is 2,800 watts!

And the minimum is 1,600 watts, which is what I am going for, I guess.

Thanks everyone.
 

NEGT1

Member
i think you should read more about lumen to watt ratios. i'll try to explain it but it's something you should look up none the less if you're interested in this sort of thing. the 600 watt lights will produce more lumens per watt so even though it's only 600 watts it will have 88000 lumens while a 1000 watt will have 130000 if you compare the hortilux super hps bulbs. using a 600 give you 6 more lumens per watt for the same price of electricity. it's only 3600 lumens per 600 watt bulb difference but when you're paying for electricity, it's nice. plus all the other stuff they said about light distribution. it's what i wish i did before i bought my stuff.

But you are failing to point out the single reason why you never see professional growers use 600w bulbs over 1k.

It's simple, a 1k bulb has a brighter light....No matter how you want to look at it, a 1k bulb is brighter. Slightly less efficient if terms of measured lumens relative to input, but that isn't really important here because the difference is minimal compared to the quality you'll see in a 1k bulb over 600w. You can place as many 1k bulbs in the same amount of space as 600w.

That said, there can certainly be circumstance where 600s are the better choice. For example, when working with less than 2k watts.
 

Former Guest

Active member
you know, I didn't really think of it like that. I was told that the 600s would be better for a rectangular setup because of this reason and would also help with heat compared to running two 1000w bulbs. heat issues aside, the difference is not much so wouldn't it depend on individual setup and canopy? the OP had a rectangular room and had already bought a 1000 watt. I'm actually dealing with this issue right now in a 4x8 tent with an already purchased 1000 watt so when looking around at responses like those above, that is what most people were saying. but I see your point. you could easily fit 1000 watts in the same space as 600s. I suppose it depends on how much ya wanna spend and are you already getting enough watts per sq ft. I will probably end up just grabbing another 1000w just so it's even across the whole canopy which is what I'm trying to figure out.
 

JointOperation

Active member
id grab another 1000w.. if u can afford it.. honestly.. u will be soo much happier with your yield if you really took up that entire space with a scrog already.. adding another 1000w could double what you would yield. maybe even MORE depending how your environment nutes.. and genetics do ..

and like he said above.. most stick to 1000ws to increase penetration to allow for the side buds and branches to achieve some nice nugs..

but when running a smaller room.. and scrogging. u want to have the canopy completely covered in light evenly. to achieve the best results and yields..

ive noticed.. scrogging and sogs to great with 600s if your not having a huge amount of buds underneath the canopy.. its really all about grow style.. and shit.. I mean ive seen dudes chose 600s just so they can have double the amount of bulbs for more coverage.. and have some vert and horizontal in the same room..

but it really depends on grow style .. and room size..

but ya another 1000w.. or another 2 600s.. would REALLY REALL REALLY increase production in that size of a room.
 
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