I found some soda straws that are thin and about the same color blue as the blue LEDs I got from goldmine-elec.com. I got the idea of using a soda straw from Quantsuff at quantsuff.com. He used two white LEDs in the ends of a short length of white translucent (semitransparent) soda straw to give
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I received a bag of 200 blue LEDS in milk white packages from Goldmine-elec. These put out a diffused blue light that has a wide beam pattern. I’ve been thinking about colored LEDs, and I’ve come to the conclusion that the colored LEDs I use don’t need to be in a clear case and the
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I was asked to fix a Himalayan rock salt crystal light to make it brighter. These lights are larger (and heavier) than a 1 liter bottle. The salt is kind of a rusty red due to iron dissolved in the salt. There are many examples of these if you search for Himalayan salt light. The
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I stopped by to see the guys at my ex- work. One guy told me they noticed the furniture had been moved around, and some metal shavings on the tables. He looked up and saw that the fluorescent tubes had plastic clamps holding them in with sheet metal screws. But he didn’t notice one thing:
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I’ll get to the ITP flashlights/torches asap, but first a bit about the ThruNite flashlights. The ThruNite Ti2 80 Lumen flashlights were only $11 apiece, so I ordered a few. They use an on/off switching arrangement that I haven’t seen before. Once the head is twisted to light at low brightness, tightening it another quarter
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I ordered these from an Amazon seller, Liroyal-led, a few weeks ago in April. It took that long to ship from Hong Kong. They are 50 pcs of Bluecell 5mm RGB full multicolor flashing LEDs. The cost was $3.45 including free shipping. The case is clear epoxy. I looked down inside and saw four chips
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Paul sent me a link to a Wikipedia article, http://en.m.wikipedia.org/wiki/Kruithof_curve which is new to me. I was introduced to some other illumination terms such as correlated color temperature by the website donklipstein.com which has a wealth of info on lighting and LED lights. Before CFL and LED lights, we were using incandescent lights which have
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I left the Nichia LED on the power supply overnight, at about 85 to 90 mA, and it didn’t seem to have any problem. I decided that I had to design a circuit to drive it from a low voltage, such as two AA rechargeable cells. I drew up a circuit, which had two transistors
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I received my order of four LED lights made by Philips yesterday. They’re called SlimStyle, but they look like lollipops. It’s 2700 K warm white, 800 lumens and 10.5 watts. The model # is 9290002707. It’s also known as Philips 433227, but I don’t see that on the package. I screwed it into a lamp
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I received box in the mail yesterday and opened it up to find a small plastic bag with the LEDs in it. The bag took up less than 1 tenth of the space inside and the rest was wadded up paper. Each LED is in a cup in the plastic tape, and covered with
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