Loving the new COBs
@BigSm0 sent. Tent is now 2 degrees F cooler than the rest of the room. I attribute that to the evaporative humidifier acting as an inefficient swamp cooler.
Much impressed with the VERY low heat dissipation. The efficiency of the chip is so far superior to single diodes, it's only having to dissipate 20 watts as heat (40 watt chip @ 50% efficiency). In contrast, my ViparSpectra 600's (260 watt draw @ 20% efficiency) each had to burn off more than 8 times that. Another benefit to less radiated heat is the humidifier doesn't have to work as hard to maintain.
Given the results people are getting with these things, I would say that overall I rate this an absolute must buy. If you can spring it, get them.