Horto
- 118
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@jumpincactus
COBs vs 1w diodes vs 3w-5w diodes.
They all produce some heat but not nearly as much as HPS even with 5w diodes. My unit uses 5w diodes and it produces enough heat to run CO2 effectivly but it is still just warm to the touch. COBs can be driven softly if you are looking to minimize heat you would just need to add more of them.
I don't use COBs but I run my 5w diodes at 15" probably and never have any burns so I would imagine a COB could be dropped even less.
I would like to know first hand from LED users are they as cool running as the mfgrs would have us believe ?
I think it comes down to leaf temps and most people don't have the meter to read IR temps on leaves. I think a lot depends on the ambient temp.
I don't mind at all.
Good LED design might not produce as much heat per watt
I should have been more specific in the equivalent Wattage for the same working light, but there in lies the whole problem.it actually produces exactly as much heat per watt
im not seeign a lot of hps journals with >1.4 g/watt, which is pretty common in the cob world. if DE hps guys get 3 p off a light they are shitting themselves at that 1.2 g/WNot convinced of the merit in LED's against HPS at this time!
Without some real data over variables, its a big change for questionable gain.
the gains are not questionable with led,even the shittiest leds(mars hydro) will grow dank plants.you choice should be based on your goals,not what someone else needs or uses,but if you want to save on power bills and keep or exceed yields from typical hid lights then cob leds are a great place to start.i put these 30 x 35 w cree cobs in where i used to have 3 x 600hps hung so i have dropped from 1800w to about 1200w and im seeing increased yields,less heat,and much healthier plants.so for me its a no brainer.since installing the first section i have continued to build light bars to replace another 3 x 600w hps and mh lamps.im down about 1400w now in usage and i def have alot better coverage in these areas.and ppfd is fanfuckintastic :cool:Not convinced of the merit in LED's against HPS at this time!
Without some real data over variables, its a big change for questionable gain.
The idea your choice should be based on Eco credentials is not a strong argument unless you were growing lettuce.
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im not seeign a lot of hps journals with >1.4 g/watt, which is pretty common in the cob world. if DE hps guys get 3 p off a light they are shitting themselves at that 1.2 g/W
This system gives me 16 ounce from 4 plants, 1.1 gram per watt.400 watt Philips "Master Son-T Pia Plus" under 88 cm wide Parabola, length 60 cm.
Just built a 200 watt cob LED light. Happy as hell with the results. Now I need to get the cash together to build 3 more to cover my space. My old LED`s (Advanced DS 300`s), were kept 16-18 inches above. Thinking the new cob LED will be similar distance.
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