which one gives more heat???

UserFriendly said:

If you run a proper exhaust, you shouldn't have heat issues. I run a kilowatt HID and I don't have heat issues either.

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how big is your grow space?

but the thing is they are different types of light, i mean if you had 600w of leds you wouldnt get much heat????

i in no way could have a hid or hps in the space i use.

hey wheres userfriendly gone, thought you were going to tell me your grow space is only a foot square or something, got a tape measure if you need it.

del66666 said:

how big is your grow space?

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I'm just teasin' bro. I use an air-cooled reflector with an 8" fan, an A/C, and an active exhaust. I didn't want noob to think he could throw up 600 watts in any old space and get away with it.

stiffer said:

but the thing is they are different types of light, i mean if you had 600w of leds you wouldnt get much heat????

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Let me dumb this down for you one more time.......

600 watts of l.e.d. = 2,047.2 Btu

600 watts of hps = 2,047.2 Btu

600 watts of cfl = 2,047.2 Btu

Do you know why air conditioners are rated in Btu? Use your fuckin' brain!

right well i hope your correct, i think its time to by a 600w hps!

It depends how you consider electrical watts versus radiance(also measured with watts).

Different bulbs have different levels/spectrum of lumens per watt. A 600w LED could put out much more usable radiant watts than HID(higher conversion % to non-heat radiance). Actual wattage is actual wattage though. That's how much power it draws.

Using equivalence... one can state.. for instance a 26 watt CFL is equivalent to a 105W incandescent. Or a 90W LED is equivalent to a +400W HID*(the claim made by LED grow light makers). One more thing you have to consider is actual LUX. That's lumens being distributed over an area. An LED can be nearly 3x as efficient as HID(around 99% power to radiance conversion). Factor in as well the fact that the LEDs produce little heat, and can be placed several times closer to the plant(several times 3). You get a multiplicative effective. 3x more efficient and the shorter distance the greater the increase.