Originally posted by Clavius I wasn't trying to answer your question. I was merely responding to the thread by adding another option.
Well yes, but since I described how I already had bought a reptile bulb and yet you were telling me about their existence at the pet store, it seemed you had not actually read/understood my post.
Quote: I have no idea why you think LEDS aren't supposed to emit any UV light.
That's what everyone insists, including the manufacturers of LEDs. And if you search for "Do LEDs emit UV light", you'll see a bunch of pontificating about how they emit zero UV. The counter-argument is given in my link above from the people trying to sell "museum quality" true no UV, no IR lamps, who say (and measure) that LED lamps emit plenty of UV.
All I know is a $10 lamp from IKEA clears a yellowed lens overnight and the UV reptile bulb takes much longer (but also works). How much this is a function of being able to concentrate the LED more where it is needed, I don't know. But with my set-up with the reptile bulb I had it only a couple inches from the lens glass (bulb hung upside down directly over lens with foil on the underside of the lens and foil all around the inside of the lamp creating a UV chamber). With the LED lamp (which has a head no bigger than a handheld LED flashlight) I jam it right onto the lens, even touching it.
The question is bigger than just yellowed lenses of course. Is my desk lamp (used a desk lamp) damaging my skin with its UV rays? Of course it is not supposed to, but since it is more powerful than a reptile bulb that actually has a warning on the box for UV exposure, you have to wonder...