PhotonWrangler
Flashaholic
I ran across this curiosity yesterday, a clear A19 LED filament bulb where the filaments appear snow-white when off. The coating makes the filaments appear a little bit thicker than the yellow ones, although this could be just an illusion. I purchased the 2700k version out of curiosity. When turned on it looks more like 3000k to me, which I prefer.
Shining a UV light into the clear glass globe reveals a dim reddish glow from the filaments. This might be a result of the glass blocking the 365nm UV wavelength so I can't tell if the white coating is actually the phosphor layer or not, at least not without breaking the glass.
The white filaments make the bulb look less obtrusive when it's off - it kind of blends into the surroundings. Interesting concept. I wonder if it affects the bulb's efficiency in any way.
**Edit** Aimed a blue LED at the white filaments and got a small amount of pinkisk-white fluorescence out of them.
Shining a UV light into the clear glass globe reveals a dim reddish glow from the filaments. This might be a result of the glass blocking the 365nm UV wavelength so I can't tell if the white coating is actually the phosphor layer or not, at least not without breaking the glass.
The white filaments make the bulb look less obtrusive when it's off - it kind of blends into the surroundings. Interesting concept. I wonder if it affects the bulb's efficiency in any way.
**Edit** Aimed a blue LED at the white filaments and got a small amount of pinkisk-white fluorescence out of them.
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