An LED lighting revolution is underway. LED light bulbs are rapidly increasing in performance capability and decreasing in price. Last year, A19 format LED light bulbs, the common household format, sold in the range of $20 to $60. There was a strong correlation between price and quality. This year, top-of-the-line bulbs, such as the LG bulb, can be purchased for $10.
LED light bulbs have about the same efficacy as compact fluorescent light bulbs (CFLs), 50 to 60 lumens/watt. However, LEDs keep getting better while CFL technology has plateaued. The 7.5W LG bulb emits 485 lumens. This corresponds to 65 lm/W. It’s a 40W equivalent. At the same 485 lumens, the old fashioned 40 W light bulb would offer only 12 lm/W, five times less.
The LG 7.5W LED A19 Light Bulb LB08D830L0A.E50JWU0 in and out of its
packaging (click on image to enlarge).
This is great. My only issue I have with the article is the notion, which I have seen expressed many times, that direct replacement of the light bulb should not be an important feature of these new LED "bulbs."
And while light bulbs did not directly replace candles or kerosene lamps nets (or whatever they were called), in the same sort of luminary, the electric lamps did closely emulate their forebears. And still do.
I've seen LED bulbs that do not arrange the LEDs in a plane, or at least they don't seem to. I have an LED candelabra based, for chandelier use, that emits light in all directions, every bit as much as a light bulb does, every bit as much as candles used to do in chandeliers.
Not saying that new types of lamps, with permanently installed LEDs, won't ALSO exist. But let's not be so happy to turn this into a racket for lamp makers, eh? Besides which, LED electronics may fail, for whatever reason, and LEDs tend to dim with use. So easy replacement will continue to be a good idea. For the customer, at least.
LED light bulbs are too recent to have much data on failure modes. Electrolytic caps are indeed vulnerable to heat. This light bulb has a nice space between the back of the LED emitters and the circuit card. That should help. Most failures I have seen in CFLs circuit cards were due to sub-standard assembly, not design.
I think that which fails first depends on the design margins. One might suspect the power electronics to be the weak link. Consider that the front end of these PCBs is an AC-DC power supply with the usual electrolytic capacitors. My bet would be that those caps are the first thing to go.
$25 each if it lasts 3-5 times more than CFL, I think it is a good deal.
If heat is an issue, which piece will go away first, the power electronics or the LED? I believe it is the power electronics, isn't it?
The 60W LED bulb has officially arrived. It's about time. I immediately ran out and got 3 of the Philips dimmables, even though they were still $25 each, just as a show of appreciation as an early adopter for this effort. The bulbs are fantastic, and kinda look like they came from the future, but I'll wait until the prices re-enter the atmosphere before I get any more.
Watching this technology improve is fascinating. I find the attempt to make the bulb look very similar to the old incandescent bulb interesting. I'm not sure how much that helps sell the new bulb ( although we do, of course, need a compatible base ), but hopefully we'll see prices drop further and then see more adoption by consumers.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.