Heat output of cobs vs cmh?

In a 4x4 or 5x5, which gives off more heat? Say 600 watts cobs vs 630 cmh? Is there a significant difference? A watt is a watt no? Everyone keeps saying leds rub so cool though

MedN00b said:

In a 4x4 or 5x5, which gives off more heat? Say 600 watts cobs vs 630 cmh? Is there a significant difference? A watt is a watt no? Everyone keeps saying leds rub so cool though

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Same watts same amount of heat. CMH will give more leaf temperature and very good Spectrum but less photons than most cobs . Olso heat distribution is different with multiple lights sources than with HiD .

Cheers !!

Argentocobs said:

Some watts some amount of heat. CMH will give more leaf temperature and very good Spectrum but less photons that most cobs . Olso heat distribution is different with multiple lights sources than with HiD .

Cheers !!

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The important part here is leaf temprature. Where as HID heats the leaf directly (desireable up to apoint, especially if your environment is cold) and keeps leaf a bit warmer than environment, with leds the leaves stay slightly cooler than enviroment. Means ideal temp for leds is about 26-27C or even hotter so you'll need less extraction/ac for a led grow if heat is your real problem.