I went to my computer club meeting this Sunday and they had a really good deal on the consignment table that I just couldn’t pass up: three 21 LED panels for five bucks apiece. They’re built very sturdy, with a body of extruded aluminum and screws holding the end covers in place. The ‘handles’ on
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This is a continuation of the original June 14 blog. I don’t think I mentioned this earlier, but the 44 LED light circuit is so simple that there is no regulation, so the LEDs can be dimmed by reducing the AC voltage. I used a sine wave variable AC voltage. But most conventional dimmers use
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I found some LED lights on eBay for under 6 dollars U.S. with free shipping. They’re shipped from Hong Kong, so it will take a few weeks to get here. They said sometime around the 4th of July. Wow! Instead of lighting up firecrackers, I’ll be lighting up LEDs!! They call these corn cob lights
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An historical document, from an old Union hardware catalog. This is before the power line frequency was standardized at 60 Hz. across the whole U.S. I originally posted this to my watsonseblog.
I went to the Antique Telephone Collectors Show today, and on the way home I stopped off at Fry’s to get a few cables. They had micro USB cables for $1.99, so I bought all three that were left on the shelf. On the way out, I saw this display in the line at the
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One of my email correspondents and botmaker, Bill Sherman, had made some Joule Thiefs inside of a jar, but this Instructible uses diluted fluorescent ink from a Highlighter pen to diffuse the light into various colors. That’s quite a nice idea, and gives the light a very dispersed and colorful look. What I would like
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I wrote a short blog about the Cree LED lights recently. Last week I bought two Cree 450 Lm (40W equivalent) LED lights from Home Depot for ten bucks apiece. The UPC label number is 13959 01932. I installed one of them in a task light I have over my laptop, which gets heavy usage,
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I thought about doing this since I wrote a blog on it back in the mid 2000s. Use the Grease Spot Photometer Method to compare the outputs of LEDs. This experiment is used in Physics classes to demonstrate the relationship between candles and the distance to the light source. In my case I decided that
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I’m trying to figure out how these Miracle LED people get away with advertising a two watt LED light is equal to a 60 watt light. These are supposed to screw into the sockets of a ceiling fan, and come in a set of four for fifty bucks when tax is included. Also, they say
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I bought an EcoSmart 40 watt equivalent LED light bulb from Home Depot on sale for under $12, regularly $20. It is very similar to this one (I couldn’t find it on Home Depot’s website). It was a bright white, which seems to be the only color they have on the shelves. Apparently all of
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