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
(Read More…)
My (ex) co-worker, Howard, emailed me a link to an article that said that the Nobel Prize in physics has been given to three inventors of the blue LED. As everyone knows, the LED is a major topic of my blog. This article excerpt says that 2015 is the International Year of Light. We have
(Read More…)
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
(Read More…)
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
(Read More…)
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
(Read More…)
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:
(Read More…)
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
(Read More…)
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
(Read More…)
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
(Read More…)
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
(Read More…)
