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:lol: Literally just a glorified CPU cooler with a shitty cob on it. Also shit PSU That whole page is lolworthy Apples and oranges :lol:

That means you're going to run them parallel right? Be sure to triple check wiring because one fault may fry a few of your cobs. 36V isn't very dangerous because skin has some electrical resistance But be careful

Artic silver 5 or any other good CPU thermal paste. (Don't get thermal epoxy/adhesive unless you're 100% too lazy for screws, epoxy is forever)

Thermal adhesive/epoxy is just as strong I think. Also depends a little on how much the holder/screw head can take. But screws are better because if you want to upgrade cobs that are attached with thermal epoxy you will have to scrape them off the heatsink.

Probably some nutritional deficiencies and/or sickness

He means wattage yes. Output is probably +-twice as well

So does inscadent lighting

Looking at the datasheets the Citiled 3000K has relatively more blue than the CXB3070 at 3000K Red looks to peak at the same nm. 105 dollar for a 243 watt cob (when driven at 2340mA) that gives 130 lm/w at 85 degrees seems like a fair price.

Probably yea. DIY becomes addicting so COBs are being replaced every time they increase efficiency by 1% :lol:

Give me a citation where I said that lifespan is not a benefit. I said that increased harvest with similar wattage is the biggest benefit, not that it's the only benefit. Learn to read.

COBs are actually already being used by commercial companies. The same cobs inside the companies that sell Cree CXB fixtures, the same COBs people use in their DIY panels. The biggest benefit from LEDs in commercial applications is not the lifespan or the reduced electricity cost. It's the fact...

Mars is just more expensive HPS with noisy fans

What is the ceramic cob in their graph? I thought maybe the CXB2530 but if that's so then they have cherry picked a lower bin. The top bin of the 2530 (3000k) puts out 143 lm/w at 800 mA Also they cherry picked to begin with since the P-25-12S3P... is a 122 watt cob while the 2530 is only 60...

COBs is more a thing that takes some time to research rather than cost. (diy)

It's a thread from 2012 though :lol:

I do wonder if that would really happen. According to the Cree datasheet the max case temp for the CXB3590 72V at 700mA (which a lot of people drive them at from what I've seen) is slightly above 125 degrees celcius. That's a pretty high temp to reach with a 50 watt 50% efficient light. I think...

Those are not full spectrum. They're also epicrap and not very cheap either. A vero 29 is only a little less than 3 dollars (digikey) more expensive than that ebay light.

I'm very certain that's the case. Here many people use CPU coolers with their (underdriven) Cree cobs while normally they're being operated in a closed environment with a bare minimum heatsink, which is why they're being tested at 85 and 105 degrees celcius too.

The ones on bal-group based on a temperature rise 60 degrees celcius above ambient which is imo reasonable enough that it's imo accurate enough for LEDs. You could also pretend that a LED is only half as efficient as it really is and then base the heat sink choice on a hypothetical lowered...