lukio
Well-Known Member
coooool, i get the efficiency thing - photon/heat output...these leds ARE putting out way more photons than heat compared to hps but its still just as hot in my tent? why is that? same watts and the same extraction. doesnt make much sense. According to robin the drivers only amount to 10% of the heat.Glad you're not adamant about that 'cause the wattage drawn by a fixture doesn't dictate how much goes to heat and how much goes to photons. If memory serves, LED efficiency driven at favorable amperage results in 50%or higher photon:heat ratios while HPS will be significantly lower photon:heat ratio around 35%.
I run an 800w 16 COB fixture with passive cooling in a 5x5 and maintain a 75-80F temperature range. The drivers (Equivalent to the hips ballasts) are mounted outside the tent but even if I moved them into the tent, there would still be a large temperature differential favoring the LEDs
i had six 260w QB kits and a 400w panel full of osrams in a 4x8, which is totally overkill i know - i had to remove two 260w kits and dim the others to 200w to get the temps down to match a 600hps, 2 kits and the orsam panel i had set up before...it caught me out...i guess the jump in watts was higher than the difference in efficiency?
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