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| I thought LED lights were efficient? |
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| jmelson:
--- Quote from: Siwastaja on April 04, 2022, 10:50:31 am ---Like wraper said, for illumination, the relevant figure is simply lm/W. Since both lm and W are reported for most types of lighting, it's easy to calculate. --- End quote --- A few years ago I made up my own LED retrofit system. I used commercial LED power supplies with high efficiency, and got the best Cree LEDs available at the time (102 Lm/W) and mounted them on long strips of PC board material to act as a heat sink. These have worked quite well, with no detectable dimming since 2014. The power supplies draw ~21 W from the mains and deliver 20 W to the LEDs. Jon |
| Siwastaja:
--- Quote from: jmelson on April 05, 2022, 04:34:57 pm ---A few years ago I made up my own LED retrofit system. I used commercial LED power supplies with high efficiency, and got the best Cree LEDs available at the time --- End quote --- Yeah, if you want state-of-art, you need to do it yourself. The exact same pattern can be seen in li-ion batteries (in battery-powered tools, powerbanks etc.) and LED illumination: cheap crap uses what was state-of-art 15 years ago; expensive brand products 10 years. Since the component (li-ion cell; or LEDs) manufacturers are producing and selling modern stuff all the time, the question is, where does it go? What explains the 10-15 year delay? Is it like production ramp-up taking 5 years (so you can't buy them in large enough volume at first), then product design cycle takes 2-3 years, and then the components sit in OEM warehouses for another 2-3 years before being assembled? I sincerely don't understand how it can be this long. It's a long enough time that hobbyists and small, agile startups have true, large advantage over the mass produced stuff anytime. |
| wraper:
--- Quote ---Is it like production ramp-up taking 5 years (so you can't buy them in large enough volume at first), then product design cycle takes 2-3 years, and then the components sit in OEM warehouses for another 2-3 years before being assembled? I sincerely don't understand how it can be this long. It's a long enough time that hobbyists and small, agile startups have true, large advantage over the mass produced stuff anytime. --- End quote --- I all goes down to economics. Why make better products and reduce your profit or encourage EU making restrictions on less efficient bulbs? https://www.mea.lighting.philips.com/consumer/dubai-lamp For example 1, 2 and 3 bulbs have 200 lm/w efficiency which you'll not find anywhere else other than in Arab Emirates. |
| Northy:
Thanks for the comprehensive replies 8) It's been an interesting read. I think I'll get a couple of the 40W V-TAC units and see how they go. Cheers, G |
| james_s:
--- Quote from: Siwastaja on April 05, 2022, 05:13:33 pm ---Since the component (li-ion cell; or LEDs) manufacturers are producing and selling modern stuff all the time, the question is, where does it go? What explains the 10-15 year delay? Is it like production ramp-up taking 5 years (so you can't buy them in large enough volume at first), then product design cycle takes 2-3 years, and then the components sit in OEM warehouses for another 2-3 years before being assembled? I sincerely don't understand how it can be this long. It's a long enough time that hobbyists and small, agile startups have true, large advantage over the mass produced stuff anytime. --- End quote --- My guess would be military, they get first dibs on all the latest cutting edge tech. |
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