MaxVft wrote:I currently have around half of my collection around 12 inches under a Yescom 225 for around 14-16 hours a day, but even the smaller plants stay almost all-green. Any advice?
How big of an area are you trying to light with that fixture? I'm not familiar with that fixture but reading about it, it's 22 watts of power at about 11" x 11" square area. In the past, I have used those bulb style LED fixtures with a built-in heatsink. I previously used one of those at 19 watts to successfully color up one pot of cephalotus. The distance though is very close with the surface of the LEDs only around 4"away from the plant. That was only barely enough for a 6" x 6" lighted footprint. Any more footprint than that and the sacrifice in coloration is very noticeable. Please check my thread about my cephalotus. Early in the thread, I posted photos of my Eden Black with great coloration that was colored up this way. Later on in the thread though, as my Eden Black collection grew, I didn't immediately upgrade my lighting and turned my Eden Black into green. The photos posted by the people who acquired Eden Black clones from me shows very green plants. That was because I was trying to light a 10" x 20" tray area with only 2 of those 19w LED bulbs. While that is technically more than enough light for that small an area, the bulbs don't have particularly good spread nor PPFD. It might be able to grow a big area, but the "coloration zone" is limited to a very small area directly under each bulb.
I'm not sure if the Yescom's 22w at 11" x 11" is enough light but one thing I'll do in that situation if I'm trying to maximize the coloration of plants using that particular fixture is to bring the light much closer to the plants and only put plants directly under the fixture's footprint of 11" x 11". Wait and see if that will be enough light. Two weeks is usually enough time for the plants to start showing if a light setup and intensity is good for coloration. If coloration is still not good, more powerful lights are needed.