| General > General Technical Chat |
| Explain to me the (de?)-evolution of LED lightbulb technology |
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| madires:
Seems so. ;D We have (had) CFLs and LEDs of all generations, cheap no-name stuff, expensive brands, mid-priced bulbs - a good mix of everything. Expensive brands fail as well as cheap stuff. In nearly all cases it's caused by cooked drivers. Lamps with a closed design (glass bowl) or spot light lamps with tight cover up to the front create additional heat stress because there's barely any air flow around the bulb. |
| coppice:
--- Quote from: madires on March 26, 2021, 11:36:55 am ---Seems so. ;D We have (had) CFLs and LEDs of all generations, cheap no-name stuff, expensive brands, mid-priced bulbs - a good mix of everything. Expensive brands fail as well as cheap stuff. In nearly all cases it's caused by cooked drivers. Lamps with a closed design (glass bowl) or spot light lamps with tight cover up to the front create additional heat stress because there's barely any air flow around the bulb. --- End quote --- Enclosed vs open luminaires explains a lot of the differences in lifetimes people see. With CFLs its not just the roasted electronics that suffer in an enclosed space. The tubes blacken much faster, too. I'm not clear why that is, as the blackening is mostly due to ion bombardment and it doesn't seem like a warmer tube should increase that dramatically. |
| paulca:
So what about "Laser LEDs"? You know that next year, if not before, they will start pushing "Laser LEDs" every where. Already in automotive. I believe it's usually a beefy cob LED with asides lighting normally itself, get's a blue laser diode fired at it too causing a much higher phosphor discharge of light... and the laser optics can focus that light into a very tight beam. |
| madires:
Might be useful for stage lighting, light shows and such things. But at home? |
| paulca:
--- Quote from: madires on March 26, 2021, 03:04:24 pm ---Might be useful for stage lighting, light shows and such things. But at home? --- End quote --- Projectors. Projector spots. Wall lights, flood lights, outdoor lights. I can see decorative and civil advantages to tightly focused security lights, for example. We all have that one neighbour with the ****ng light house that goes off with every cat walking through his garden. |
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