Too early to tell for me. But my gigantea has been under it for a month and haddoni just a couple days. They both seem to do just fine.
Switched from 250W DE to 4 Elos 21W Estripes.
Thanks for posting. Please keep us updated on this thread. I'm hoping that we get more feedback as this is an important topic for anemone growers.
There are already a couple of LED threads here. Bottom line - if you use the right LEDs with high enough intensity, you can keep anemones.
Eventually ALL aquarium lighting will be LEDs (as will all household lighting). They just aren't quite there yet in terms of intensity and price. Good news is they keep getting brighter (i.e. more efficient at generating light), higher power, and lower cost. Because LED's are based on an electronic technology platform, they are following a similar improvement curve as microprocessors and memory. Right now LED prices are falling 50% every three years. In ten years you'll have a hard time remembering what incandescent and flourescent bulbs were - just like today you can't GIVE a CRT computer screen away.
If people are struggling with LED's right now, it is often due to lack of intensity versus lack of PAR. PAR is important for zooxanthellae. The term "intensity" I am using as a blanket term that includes broad spectrum lighting (including a fair amount of UVR) that causes marine animals to develop dark pigmentation. I am not completely familiar with all the science, but suffice it to say that when not kept under the right kind of BRIGHT lighting, SPS and other marine critters can become lighter in color or change colors altogether. This is unrelated to the term "bleaching" which typically means loss of zooxanthellae. So for some people using LEDs, their critters maintain the dark brown color of healthy zooxanthellae (due to high PAR levels) but lose their secondary "pretty" coloration.