And beware of trying to use the old-style triac dimmers to supply anything with a conventional transformer. At some settings of the dimmer knob you'll probably get a substantial DC component and end up taking out the fuse at best or frying something at worst!
I recently saw an ad for an LED landing light, and I think that it was rated for quite a few thousand hours, which certainly beats the 200 hours, or less, from a regular landing light. And if those lights only went for $200 I would rush out and buy a pair for my car. AT LAST, a way to deal with those jerks and the HID lamps that blind and dazzel. Let them know what real eye pain is. I am aware that the technical apologists claim that that dazzeling blinding beam is not bothering us, but I find otherwise.
We recently purchased a third-hand loft bed for my son. It came with a mounted traditional incandescent desk light, equipped with one of those odd, long and tubular bulbs (burnt out).
I went to eBay, and for under ten dollars shipped, bought a self-adhesive, warm-white LED light strip and 12V wall-wart. It's quite nice and I was able to just stick the light up on the underneath of the loft where it's hidden from view but provides nice light onto the desk.
This week my wife mentioned about wanted it dimmable, so I just ordered a small mini-dimmer and multi-mode controller for it from eBay for under two dollars shipped. I have no idea how this stuff can be sold so cheaply and still work!
You can make them work, but it's hard. There have been articles in the magazines (including yours, I think) on doing it. And it leaves a lot of vulnerable electronics to cook at the base of the lamp.
Base-up in a small enclosure open only at the bottom is the worst case--like the fixture on typical ceiling fans. I measured the temperature at the base of the lamp with an IR thermometer after only 30 seconds of operation: it was already up to 155 degrees F. Temperatures that hot will quickly bake an electrolytic capacitor to failure.
A middle school team from Rochester, Mich., has again nabbed the grand prize in the annual international Future City Competition, which drew students from 37 regions of the United States, as well as from England and China.
The word “smart” is becoming the dumbest word around. It has been applied to almost every device and system in our homes. In addition to smartphones and smart meters, we now hear about smart clothing and smart shoes, smart lights, smart homes, smart buildings, and every trendy city today has its smart city project. Just because it has a computer inside and is connected to the Web, does not mean it is smart.
Are you being paid enough? Do you want a better job? According to a recent survey Manpower released just before Engineers Week, employers and engineers don't see eye-to-eye about the state of US engineers' skills and experience.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.