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I thought LED lights were efficient?

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tooki:
Do they, though?? Military and aerospace generally tend towards being technically conservative, sticking with older, field-proven components. Sure, there are some areas where they’re cutting-edge, but I think that on the whole they lean quite “old tech”.

Someone:

--- 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 ---
Try getting a volume order of the latest bleeding edge LED efficiency, its often easier to get small quantities of the edge bins while the process keeps improving, there is significant ramp up and even anticipated bins that never end up being produced in production volumes. But the LEDs that are available in volume? my guess would be going to the people who will pay the premium for the extra efficiency because of 24/7 or very high duty applications: retail lighting, airline interiors, TV studio lighting, etc

GLouie:
I recently took apart a failing Costco Feit 60W 90CRI LED bulb, and I think I will just be tossing the failed ones instead of trying to repair or scavenge.

They are difficult to take apart. The entire base is a formed aluminum cone with a plastic overmold, then the plastic globe is silicone glued on and the threaded base dimpled on. I had to destroy the housings to get to the LED plate and circuit board, and I do not see a good way to disassemble and replace after a repair. The LEDs are reflow mounted, in this case 12 on a MCPCB disc arranged in 2 parallel banks of 6 in series. On mine, 1 LED had failed taking down a bank, so the whole lamp immediately had half output. The remaining 11 LEDS appear to at least work with a DMM diode test. I didn't research what LED these could be or the solder mount pattern, so couldn't say if these might be useful somewhere else. Soldering should be easy enough with a hot plate arrangement. Your Feits could be different.

Probably further discussion of these should be in a new thread.


--- Quote from: cdev on April 05, 2022, 04:22:34 pm ---I was having lots of problems especially with "feit" brand LED replacement bulbs widely sold at Costco, Home Depot, etc.   But recently have been buying Phillips Warm White, and some cheapie MR-16 bulbs on ebay and they turned out to be very efficient (dont even get warm) very bright, a good color and generally GOOD.

Since I have a bunch of the fixtures around, this is great for me.  So now my wife and I are using (I think) 100% LED lighting.

Despite the Feit fiasco which left me with a lot of defective Feit light bulbs which I would like to repair or remove the defective parts from and fix, or reuse the LEDS or something.

Sometimes they half fail and cause RFI. Anybody have any good suggestions of how to effectively use all the white LEDs? (from LED bulbs that have burned out - either one or several LEDs have died rendering the bulb useless and dark unless the bad LEDs are replaced by means of hand soldering.

--- End quote ---

wraper:

--- Quote from: Northy on April 05, 2022, 07:35:03 pm ---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

--- End quote ---
Most of what V-TAC sells is below average. Of what you linked, V-TAC is the worst. Buying V-TAC is quite pointless unless you get them 2-3 cheaper than something decent.

themadhippy:

--- Quote ---Most of what V-TAC sells is below average. Of what you linked, V-TAC is the worst
--- End quote ---
Have you actually installed any of there stuff? On a previous contract  we used a lot of there  stuff,the only minor issue was the ip rated down lights didnt come with instructions on the order of  2 silicon seals,however trial and error  got it sorted.Over 12 months on and no call backs or failures and were not talking 1 or 2 fittings here,im talking about large retail spaces.

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