I am using 4 42w CFLs (8800 Lumens) currently but thinking about going to HPS (70w), I found one for 70.00, my question is how much heat does HPS generate compared to CFLs. I understand my results should be better in the end with HPS.

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(Genesis 1:29-31):Then God said, I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food. And to all the beasts of the earth and all the birds of the air and all the creatures that move on the ground-- everything that has the breath of life in it-- I give every green plant for food. And it was so.

Hey buddy, you'll need to ventilate for sure. One point you got wrong....that word "should" has no right to be in that sentence. It will be better!

Having said that, if you got $70.00 for a hps light, save and come up with $50.00 more dollars for a total of $120.00 ahd buy a 430 watt at High Tech Garden Supply
peace

if you want heat get a halagen light lol wont help your plants much tho mate gett a four hundred w hps it will grow so much better:twisted :

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who said money does't grow on trees cos i got 3 of them that will prove you rong lol

There won't be a lot of difference in heat output between 168w of cfl's and a 70w HPS, if anything the HPS will put out less heat than the 168w of cfl's.

heat takes a backseat to light output. save your money and buy a serious light.

Thanks... thats what I was wondering....I only have a small stealth cab (3 ftx2 ftx16 inches) and have it cooled/vented for CFLs and did not want to change cooling/fans if I upgraded to HPS, also 70-100 watt should be sufficent for my 2 ladies.

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(Genesis 1:29-31):Then God said, I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food. And to all the beasts of the earth and all the birds of the air and all the creatures that move on the ground-- everything that has the breath of life in it-- I give every green plant for food. And it was so.