You can still buy 100W and 75W incandscent bulbs. IR coated Halogen bulbs meet the current guidelines. Even better, you can get the lumen equivalent of a 100W 'standard' bulb using only about 80W, and they have the same 'instant on', the same dimmability, the same cold weather performance.
Until the LED technology matures, and I don't believe it will be based on 'Edison' based bulbs, I'll be using mostly CFLs, with a few IR Halogen bulbs in particular locations.
The challenges is very well explained by Poplawski and they are somewhat complicated to be handled in present day technology and scenario. But the good news is LEDs have taken it place in many lighting applications at entry level and it is pushing very hard from both the ends so the technology will finds it way to penetrate in other lighting applications as well.
CFL's and electronic ballasted T8 tubes are demonstrably more efficient than incandescents.
I cut my church's electric consumption by 50% by re-lamping.
LED's? Not so fast. Not so efficient. Part of the apparent brightness is more condensed beam.
Glare results. Drive circuits are relatively complex..and you have to account for full life cycle costing--the energy it takes to MAKE the LED array and drive circuits, in the analysis. So they're nowhere near as efficient as commonly claimed.
LED's make sense in traffic signals and commercial vehicles, where the labor costs of maintenance are significant. Elsewhere, not so much.
Silly question, but don't you realize the light bulb ban was overturned in December 2011? It was snuck in as part of the budget extension. Now, companies have still begun phasing out the 100w bulbs, because it's the right thing to do from an efficiency standpoint and they probably figure it's only a matter of time for it to come back. I personally prefer incandescent over CFL (which have a grossly overrated lifespan estimate) but I did just switch all my landscape lights to LED. Same brightness & color rendering with 1/10 the power used. And no flicker.
I am much less concerned with the flickering as I am with the short life and high costs for the LEDs. The day to day annoying issue that I have run into with a number of the LED lights is the high frequency whine that the power conversion circuit generates. This is really a background but hard to ignore noise. The dimming issue is a bother but never bulbs can be dimmed (not sure how they are doing it, I don't own any). I went out and bought a 4 pack of 100W good old fashioned light bulbs just to have them. I resent the nanny state regulating things that directly impact me and wish the government would allow the free market to drive innovation and improvements not silly laws.
@agk I agree completely. I had never heard or thought of led flicker being an issue at the frequency they operate at. Why are they wasting time on this.
Also why be overly concerned about making leds fit traditional fittings. Light fittings, not just the bulbs that fit them have limited lifetimes as well.
Many people update them when they paint a room
and a lot of fittings actually fail from the heat of incandescents.
If you can buy a whole fitting with led lamp for the price of an led bulb that fits bc or edison screw fittings. I know I'd rather have a whole fitting.
With the proliferation of fluroscent fitting formats in the past 20 years and add to that the halogen formats etc I wonder whether it is more of importance to build an led bulb for performance and reliability than be concerned about backward compatability.
You only need to look at handheld torches to see nobody was concerned about throwing out their old incandescent torches for the bright new led torches available.
The author has discussed about the effects of flicker coming out of the light bulbs. It is very true. I compared the 4 ft tube light with inductive ballast and with electronic ballast. I found there is a great comfort my eyes felt with electronic ballast generally this works around 40 kHz. Because the light has high frequency flicker which is not detected by the eyes. The inductive ballast works at line frequency 50 or 60 hZ give us visible flicker. A LED light generally works on PWM principle at a higher frequency than the line frequency and so the flicker problem is minimum or not visible at all.
The banning of the 100W and 75W light bulb has been done without fanfare, because those who support it are hoping the majority of the country simply doesn't notice. I suggest you write your congressman, and respond vociferously to silly, distorted posts that characterize banning light bulbs as a failure to follow the great example of China. When did it become seditious to sell 100W light bulbs in the US? Last year in CA, Oct 2012 in the US (after a short reprieve pushed through by Bachman's evil cohorts) in the rest of the country. Google it.
Don't buy into the semantic distortions, or the attempts to characterize supporters of economic freedom as Luddites. The real Luddites are those who don't believe in letting AS's invisible hand do its work. Turn off your computer for a bit and read an economics book.LEDAgree, my computer is on, as is the case for anyone who is reading this (not a very perceptive suggestion, by the way!). What global world should we join? One of Europe, where econonies are stifled under the growing beaucratic state? One of China, where freedom is a concept that may develop in the future? I choose neither, and I hope many more do the same in November.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.