LED streetlights are decimating moths in England. The LEDs have blue light which insects use to see. The moths are pollinators like bees plus they’re food for many animals. There are a number of solutions for mitigating the problem. The blue light can be filtered out, among other things. My thinking is that the streetlights
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I found that 100 uH was a good all around value for these solar garden light circuits. But at the time I made these around 2009 the 5252 4 legged chip was uncommon and almost all the garden lights used 2 discrete transistors. I don’t know why they started using the 4 legged 5252 –
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From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on the
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From FB comment to Bill Sherman’s candelabra lamps. Bill Sherman Sometimes I wonder what is meant by dimmable. If a LED light uses hundreds of microfarads for the DC filter capacitor, then when the light is dimmed, the long time constant causes it to flash on and off when it is dimmed. So if the
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I’ve had several LED purchases that were LEDs of poor quality, actually factory rejects. The sellers may not have known that the LEDs had “chipped chips” missing a piece, or bubbles or inclusions, but even more commonly, the LED chip is off center so the beam pattern is distorted. I let the sellers know, and
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I was at Daiso, the dollar and a half store where everything is labeled in Japanese. I saw a little gizmo that looks like it runs off batteries, and heats up a fine wire to melt and seal plastic bags. I got to thinking about it after I left without one. A few years ago
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I bought a few dozen 1 watt LEDs when they were on sale last year at Electronic Goldmine. They go on sale periodically, for well under a dollar each in a package of 5. A while back they offered daylight but recently they have all been warm white. These are surface mount, so they are
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It’s been awhile since I blogged this, so I may be saying what I’ve already said before. But I get comments from others about how to make measurements of the LED brightness. A recent one is in the comments of an older blog. Many Joule Thief builders don’t have the minimum tools needed for some
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I talked to a club member about LED lights and how much money they saved in electricity. But he said he stocked up on incandescent lights before they were banned so he could have them for his radio room. He has had problems with LED lights causing RF interference with his radios, so he went
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LED bulb prices are still coming down, but the general public is still not aware of the advantages and still think the prices are too high. And the public is still unaware of the long term savings in electricity from which they’ll benefit. I still see 60 and 75 watt incandescents in dollar stores, which
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