Fits Bioluz 2700K 4" 15W LED Diffusion 90 degree (listed). I have placed a 4" Torchstar 15W 2700K next to this one for direct comparison. Torchstar is listed as a 130 degree diffuser. I placed them side by side about 3 feet apart on a wall. I can say without a doubt these bulbs are identical. Same color, same brightness, same dimmer, same dispersion pattern, same clips, same Edison adapter, same plug, everything. So this rating goes for both. Why 5 stars? Because these things are bright! You won't find anything that bright in a 4 -Inch store find in big boxes. Buy a dimmer and you'll get exactly the brightness you want. Color is good. I think the color could be a bit warmer, but just as good for an LED. I've seen that if You buy an LED it's as good as it gets Heat isn't detected About the glass I'm not sure but when I put my hand on the lens I felt it was the ambient temperature Coverage: I set my glasses about 12 inches from the wall and the light started hitting the wall 6-9 inches from the ceiling. The coverage is really good for another 3-4 meters and then it starts to dissipate. But that's about the same as any other lamp I could put in, be it an incandescent lamp or something else. And when you turn on the dimmer, you probably still have too much light. So I went with Bioluz because I need more, and at the time of writing, they're a dollar less each on Revain. No other reason. They are both fantastic and I recommend both. UPDATE: I ordered and installed the remaining headlights from Bioluz. I would like to make a few small corrections to my original review. When these lamps are turned on at full power, they get hot. If you leave them at full brightness for a while, you won't be able to touch the bezel. Or at least you won't be able to keep your hand on it. I turn on the dimmer and at the levels I turn them on they stay cold. So if this is for a large room where you are cranking the lights up, take that into account. But I suspect that for most people you'll need to lower the intensity. Color Temperature - I actually found it to be quite warm. And I still do. But they are not as warm as incandescent bulbs. You're close and for me it's worth the trade. But they are a little harder. You have a start time. They don't turn on right away. It can take up to 1-2 seconds for them to appear and then they disappear. Doesn't sound like a long time, but it does mean that when you enter a dark room and turn on the light, you have to stop and wait. Doesn't bother me but drives my partner insane. They don't hum. I use Lutron Skylark Contour CL dimmers. There is no sound at all. I have 2. Great job. Accomodation. Originally I wanted to place the light 18 inches from the wall. I kept bumping into the floor joists, so I was more or less forced to set them to 12 inches. If you have the opportunity, place them anywhere between 15 and 18 inches. They hit the wall a little high at 12 inches and the bright spot is a little high. It also means you won't get perfect coverage on your paintings. I didn't have much of a choice here, but take my word for it: at least 15 inches. I think I need to add a few more glasses and put in some suggestive image rings.
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