81–90 of 202 posts
> In order to put the emission peak in the visible spectrum, the filament would need to run at ~5700 °C (...) No metal can survive these conditions: Tungsten melts at "only" 3422 °C. Hmm, can we possibly find something that does survive at 5700 °C to use as a light source? Perhaps molten metal confined in a magnetic field...
I've never had LED lights last anywhere near the purported 5-7 year timeframe. The worst ones are the small decorative ones with the tinier screw part that my house seems to have an inordinate number of. Those last maybe 6 months and then they start getting dimmer and then all the lights in the circuit get worse at once. I like LED lights immensely but the idea they last even 2 years is a lie in my opinion.
I bought all new Philip hue bulbs going on 7 or 8 years ago now and not a single one has gone bad. Maybe you're just buying cheap poor quality bulbs? A 100 out of 100 success rate after 8 years.
BTW, I don't understand why having the driver converting AC to DC inside the LED spots is the default. For a new house, it seems to make sense to me to have at least one external driver for a ceiling of spots, if not one per floor (not one for the whole house because pf the drop in voltage). But 24V led spots seem much less common and I cannot find many reviews. Any idea why it's not more common ? It seems efficiency…
because LED bulbs are drop-in replacement for incandescent bulbs. AC is pre-installed
stand-alone LEDs don't have converters, be it singular or be it strips
I've never had LED lights last anywhere near the purported 5-7 year timeframe. The worst ones are the small decorative ones with the tinier screw part that my house seems to have an inordinate number of. Those last maybe 6 months and then they start getting dimmer and then all the lights in the circuit get worse at once. I like LED lights immensely but the idea they last even 2 years is a lie in my opinion.
I've never had LED lights last anywhere near the purported 5-7 year timeframe. The worst ones are the small decorative ones with the tinier screw part that my house seems to have an inordinate number of. Those last maybe 6 months and then they start getting dimmer and then all the lights in the circuit get worse at once. I like LED lights immensely but the idea they last even 2 years is a lie in my opinion.
5700 is a terrible temperature for lighting unless that matches the daylight. Soft white and even reddish is much better at night. Presumably, most artificial light it used at night. 2700 is more like it. My LED lightbulbs change temperature based on the time of day and are dull red at night so you both don't wake up and you don't stub your toe. Show me a non-LED that can do that.
Lighting color is cultural. Go to Asia and you'll find many places, commercial and residential, lit with 5500K, traditionally fluorescents. I've heard a theory that it has to do with genetics and lower eye sensitivity.
I've never had LED lights last anywhere near the purported 5-7 year timeframe. The worst ones are the small decorative ones with the tinier screw part that my house seems to have an inordinate number of. Those last maybe 6 months and then they start getting dimmer and then all the lights in the circuit get worse at once. I like LED lights immensely but the idea they last even 2 years is a lie in my opinion.
I guess if people are nerding out on lights in this subthread, maybe someone can recommend me a type or source for low-K (say, 2200K or something thereabout) bulbs with good CRI (yes, I know, but I can still notice a big difference at 2700. I don't know how low it will matter to me, but I want to see)
[1] https://store.waveformlighting.com/products/superwarm-1700k-...
[2] https://store.waveformlighting.com/products/lux24-circadian-...
I've never had LED lights last anywhere near the purported 5-7 year timeframe. The worst ones are the small decorative ones with the tinier screw part that my house seems to have an inordinate number of. Those last maybe 6 months and then they start getting dimmer and then all the lights in the circuit get worse at once. I like LED lights immensely but the idea they last even 2 years is a lie in my opinion.
I have a room which is lit for like 10-20 hours per day and so it clocks up hours very quickly and my LED lamps are guaranteed for 2 years so I figured surely the guarantee would trigger but nope, I began keeping receipts and turns out that I only need to replace one every 3-5 years it must just feel frequent because it's annoying, I just dug out the most recent receipt and it's from 2021. I will continue keeping the receipts to feel better about the annoyance.
Tyrell: The light that burns twice as bright burns half as long, and you have burned so very very brightly, Roy - Bladerunner (1982) also, I enjoyed the last lines of the article: Also, to preempt the orange site, I'm not saying that planned obsolescence doesn't exist.
BTW, I don't understand why having the driver converting AC to DC inside the LED spots is the default. For a new house, it seems to make sense to me to have at least one external driver for a ceiling of spots, if not one per floor (not one for the whole house because pf the drop in voltage). But 24V led spots seem much less common and I cannot find many reviews. Any idea why it's not more common ? It seems efficiency…