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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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