Ceramic Metal Halide or Light Emitting Ceramic, CMH/LEC

Chip Green

In Bloom
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This spot here, there's a top directly under a vertical hood. 12 inches (ish). That's about as close as I've gotten without seeing any ill effect.
This room is a hodge podge of different shaped 315 hoods, and HLG boards.
Took it right to the brink of overgrown!!!!
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Also to be noted, this has been flowering at 10/14 for just beyond 30 nights. The photon saturation is so high, I can get away with shorter "days".

I generally have a little more wiggle than a foot, but they seem to be taking it well.

@Skunky Dunk Farms , I also use a cheapo brand(Dr. Meter) LUX device.
Works wonders with white LED/CMH to get an idea of light levels. Not nearly as precise as an actual PAR meter, but once I know how my meter reacts to my equipment, it's a great tool for baseline setup.
30K and above LUX, pushes chunks.
 
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spyralout

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I will vouch for CMH, Philips premium bulb. I sprinkled in a few bare bulb using the sockets from cheap HPS hoods along w Different bar LEDs in different tents, one set of 600w GV2 from Canada via @Turpman and two sets of 600w Kingbrites w Samsung LM301H w Cree Reds. I tried using the wing hood but it didn’t work out well due to space limitations. I burned my shirt sleeve once on the bare bulb. However I did notice smth about the CMH. The plants that were closer to the CMH produced more “fuzzy trichs” like a carpet. It was very obvious when compared to the other plants that weren’t as close to the CMH. After all was said n done, the buds that had those fuzzy trichs were consumed first. I first discovered this after watching @Capt. C run his 315 Sport light, which had a CMH in the middle surrounded by a square of LED boards. After a sample zip worth of some spectacular Mac1 fuzzy trich bud I was intrigued to see if I could reproduce this and the CMH was the secret sauce.
 

DemonTrich

In Bloom
In my testing with cmh.
Cmh veg bulb (Philip's 942 bulb) works great in flower. Lowers heat by 2* per bulb/hood vs the 930 flower bulb. The 942 bulb produced tighter node spacing and more frost. Albeit at a slight less weight (aprox 3/4 oz per plant, normal 5oz plant average weight).

Ushio beat Philip's cmh by 2umol of uvb. Philip's beat/s all other bulbs in every aspect.
 
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