Do these change color indoors due to UVA rays coming in through the windows, or do they only work outdoors?
1141352
The works with sunlight and long time in black UV light. Best with sunlight. Will work both behind a window and outside.
935393
Truthfully, have not noticed if it does, but would like to hear from others if the experience has been different. As to their effectiveness during the day and night time, no problem during daylight, but at night time a strong source of lighting is needed for the ones that I have if you want to be able to see anything. There may have been an improvement (?) after the ones that I purchased.
925899
I have two of them and just love them. The color depends on your light in the room. Most of the time, mine look more black. If the sun hits them directly, they look a bit more brown. Hope this helps. Susie
535439
I don't know the answer about UVB and UVA rays I only used them one time as they were too big for my hands and got in the way of the polish. I feel like it is better to cover up all you can while using the light. I had a squamous cell cancer on my foot in a place that hardley ever is in the sun. Hope these work for you.
1693642
From tech support at Hydrofarm: Thank you for your inquiry. The bulbs emit an extremely small amount of UV. I suggest getting bulbs specifically for UV light. Feel free to reply with any further questions.
739183
No, they only work in room size areas and would really not have any effect when used outside.
1452165
Colors do change. Could be defective. Bought one last year no problems. Needs to be out in sunlight for at least a day.
625940
Mine are fine, it's under an awning so not in full sun all day long, I read revues before I purchased, and others had mentioned fading, but mine have not
125445
According to eHow and several other sources I have read, there is no UV emitted by LED's. Their spectrum is very limited and neither the high frequency end (UV) nor the low frequency end (Infrared or heat) are emitted. The result is a very efficient light emitter right in the spectrum to which the eye is sensitive.
703992
I've had them for more than two years now. The effectiveness of the UV light doesn't seem to be affected with buildup although I change the light every year. The filtering is on the weak side.
15114
According to this window film manufacturer, UV light only accounts for 40% of fading, and most windows block 20-40% of UV just by being glass. This would slow fading, but not prevent it entirely. http://solarsolutionsny.com/fading.html
1814805
If they are in a very dark area with no light source they will be on 24/7if near a window during the daytime they will be on but very dimif an actual room light is on, they will be off completelyIn all cases they are working as designed.
1428917
They aren't colored and don't stain clothes or patios or anything. They do a good job reflecting light so they APPEAR colorful but they don't have dye or anything in them.
304580
I would google ultraviolet vs led and read the answers. A good one was this one www.nsinails.com/.../led-vs-uv-by-rise'-c...Hope that helps!!Crystal
1489075
I have used them both inside and outside. They have been on for about a year now with no problems.
1592302
I agree with previous answers about the colors are muted on the back side. I have a caution against using these on a window. In my son's room there's 2 outer walls that have temperature fluctuations, and when I had to remove some, they took the paint along with them (whereas ones on the inner walls had no problems). So, on windows, you might have to remove adhesive when taking them down.
192839
UV has a light wavelength below that of the visible range. Since these lights are all within the visible range (minus the red which has part of it in the IR), there should be no UV rays.