When I go to the big box stores I usually stop look up the flashlights to see what’s new. I often see a palm sized flashlight with 27 LED’s, 24 of them on the flat side. The case is rounded on the corners and is typically yellow and black; the price is about $4 or
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I took apart a “Type R” LED light, which is a substitute for a wedge base auto light used in instrument panels and dome lights. This light has an 8 mm diameter LED and a 560 ohm, 1/8 watt resistor in the wedge base. Assuming that the LED drops 3.2 volts and the auto’s battery
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I think that, with the price of LED light bulbs coming down to commodity levels and their long life, the CFL bulbs will become more difficult to obtain. The LED lights are more efficient than CFLs or incandescent bulbs, and there has been a steady increase in Efficiency over time, which will probably continue. Someday
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Well, this is not new, the 100 watt and 75 watt incandescent bulbs have already been banned for awhile, but starting today, 40 watt and 60 watt incandescent bulbs will be banned. These will no longer be manufactured or imported into the U.S.A. There are some exceptions, such as appliance, fish aquarium and specialty lights,
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This is a continuation of the 2013 Dec 18 blog. It was getting too long, and so is this blog. Update Dec 24 – I searched for high current pulse gen schematic using Google and I didn’t come up with anything near enough to what I’m looking for. I saw a lot of high tech
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Kirk commented that I could hang the Gravity Light from the attic and let the weights drop into the basement. Problem is I don’t have a basement, and my attic isn’t much bigger than 3 feet (1 meter). I wouldn’t gain enough to make it worth cutting a hole in my ceiling. One guy once
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Well, the LEDs I ordered more than a month ago have finally arrived. They are 10 Watt(!) 900 lumens from Electronic Goldmine for $6 (USD) apiece (I checked their website and they seem to be sold out). The reason why it took so long was mostly my fault. They were shipped to my previous address,
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A lady at work brought in a solar garden light for me to look at. The problem was that it wasn’t working. It consisted of a string of LEDs, all colored orange, just like a Xmas tree light string. On the end was a small box that fit in the palm of my hand. The
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A 2011-08-07 watsonseblog post from the Way Back Machine: (the second resistor is a 1 ohm resistor in series with the LED for measuring the LED current.) 2011-08-07 2011 Aug 07 Dual LED Odd Colors … When a white LED is connected to a power supply or 6V battery, in series with the required current
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One thing I’m glad to see is that many of the problematic parking lot lights have been replaced. These are the ones with the big, pinkish yellow light in them that has what I call the ten off, ten on syndrome. Once the light has spent a half hour heating up, it stays lit for
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