PhotonWrangler
Flashaholic
As I'm always on the lookout for a decent LED blacklight, I just bought a 2 pack of Sylvania "Black" LED filament bulbs at a chain DIY store that starts with M. These bulbs don't say "black light" on the carton, just "black" with a drawing of a violet bulb. Hmm. It says the same thing on the screen printing on the top of the bulb itself. There is no mention of the wavelength on the package.
The LED filaments are coated with a phosphor. This should have been my first clue that something was amiss. Why would you need to use a downconverting phosphor to produce UV?
When I turned the bulb on it produced a sickly pinkish-purple color. Turning it back off and illuminating the phosphor coated strips with an external blue/violet source, the phosphor glowed pink. This is way at the opposite end of the spectrum from black light. WTH?
These bulbs aren't even useful as Near-UV lamps, nor do they even suffice as a normal pink bulb. The color is just weird. I have no idea what they were thinking at Sylvania when they produced these.
A 2-pack cost me $10. Save your money for something else.
The LED filaments are coated with a phosphor. This should have been my first clue that something was amiss. Why would you need to use a downconverting phosphor to produce UV?
When I turned the bulb on it produced a sickly pinkish-purple color. Turning it back off and illuminating the phosphor coated strips with an external blue/violet source, the phosphor glowed pink. This is way at the opposite end of the spectrum from black light. WTH?
These bulbs aren't even useful as Near-UV lamps, nor do they even suffice as a normal pink bulb. The color is just weird. I have no idea what they were thinking at Sylvania when they produced these.
A 2-pack cost me $10. Save your money for something else.
