LED Filament bulbs
Does anybody have any experience with these new so-called LED filament bulbs?
It’s an unusual design, featuring thin LED “filaments” composed of about 25+ tiny LEDs mounted in series on a metal or glass substrate, then encased in phosphorous-impregnated silicone. A high DC voltage (> 70V) is placed across these “filaments”, which are suspended in a clear bulb with electrodes in a manner nearly identical to incandescents. A simple power supply fits inside the screw base. It appears that the heat dissipation qualities of the filaments and power supply are good. Efficacy seems to be typically >100 lm/w.
To me, it appears to be an attractive and creative design that actually looks like it can succeed as drop-in replacement for incandescents in terms of looks and quality of light (i.e. radiation pattern).
Here are some videos I found that tear them down and explain how they work.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part