Just got a letter from lights of america, stating that the life listed on their led bulbs was mistated. And that if I so desired i could return them to the store of purchase and get a full refund. that would mean that bulbs that are 2 years old or close to it could be replaced with new ones at no charge.  I have multiple 5 watt multi-leds on dusk to dawns, providing light on my wood stacks, front and side parking areas, and up the front driveway. they are resonably bright, but have a very blueish hue that makes everything kinda hard to see.

back when my dad worked for GE they had an article in the co mag about the future of indoor lighting, GE is working on having whole panels of leds for room lighting, they would make a whole wall or ceiling the light fixture, they were working on office space installs at the time, retrofits to exsisting houses are down the road from there. The cost would be high initialy, but pay for itself over the life of the building due to reduced power use.

Just heard a NPR story about the Dept of Energy(?) doing a contest to get a LED that is an exact replacement for a 60w incandescent.  Phillips submitted 2,000 for testing and 4-5 other companies are nearing submittal.  The had to be the same lumens, be dimmable, be the same color temperature, be omni-directional, size…etc.  Sounds like some better LEDs are on the way soon.

Last I looked, the LED’s put out comparable lumens per watt as the compact fluorescents (I could be wrong).
The CF’s really aren’t too bad, except for the warmup time and dimming.
I’m thinking some other technology will come along and leapfrog led’s for general lighting.

the big problem is LEDs are directional, great for reading in the car or plane, lousy for lighting up the whole room, might be time to go back to polished tin ceilings to spread the light around.

I realize this thread may be getting old but I did want to report on one brand of LED lights to avoid. I had picked up about 20 Osram Sylvania LED strip lights for a home remodeling project. They were intended to be installed in a very hard to reach location whihc made the long life claims a big plus. Before I could install them, I needed an under desk light for my office and hooked one up. This is a very similiar installation as an undercabinet light with ventilation on three sides and being fed from a commerical grade UPS that supplies all my office equipment. To date I am on my fourth light in about a year. The light is typically run 8 hours per day 5 days per week. I have done a postmortem on one of them and its obvious that one of the LED’s have failed. The way the units are wired when one LED goes the entire fixture stops working. I usually can detect significant dimming before they go out. 

These units are made in China for Osram and of course Osram no longer sells the units. Nevertheless Osram Sylvania is a legitmiate brand and therefore even bug names havent figured out all the bugs with LED lights.

One thought I’ve had, but not looked into very much, is to wonder about trying to use some of the LED lights developed for the automotive / trucking industry, like these just as a sample (Haven’t done business w/ this outfit, just giving the link as a type sample).  I haven’t done anything with the white LED vehicle lights, but I have used the red and yellow versions on one of my sidecars, and have been VERY impressed with the amount and quality of the light they put out, not to mention the low current draw and long lifespan…

Obviously since vehicle lights are designed for 12VDC power, one would need a transformer of some sort, but they draw so little power, you could probably run several off a “wall wart” style power cube…

The only question might be how much actual illumination they put out, but since they are being billed as good for cargo and back-up lights, both of which are apps where one expects to get illumination, they might do pretty well…

The other thing that might be nice about them is that they are quite compact, and don’t need a lot of room to mount…

Gooserider

I saw the cree lights in january 09 at a trade show in Vegas- dimmable and very good light.  The display showed a convetional lamp,  next to their LED.  they are costly, but I am really opposed to CFLs .  I have tried LED from the big box store, and some I bought on line, and am not happy with any of them, except for that the draw is very low.  I did buy a flood light- intended for an outdoor fixture, and was dissapointed in that as well.
i do beleive however that it won’t be long before Leds overtake cfls.  the technology just has to evolve a little more
I have them on every corner of my truck, and love them
I had to order the Cree lamps-  putting them in 6” recessed lights,  I’ll be sure to report back

I’m just barely beginning my adventure with commercial LED lighting. OTOH I have worked with smaller LED indicators in electronics for 30-40 years now, so I’m not at all unfamiliar with their evolution.

LED lamps are pretty darned pricey. I did spy some discontinued ones in my local Walmart, and I bought a couple of them. Made by “Lights of America” (in China, of course). Designed for 12VAC power in track lighting or landscape lighting. These are model 2001LEDG53-65K and I paid 5.87 each for them. A pretty good price for an LED lamp, I’m thinking. A lot of what I saw in stock recently had price points of around 12 bucks, 25 bucks, and on up to 40+ bucks for floodlight replacement units. Yikes! I think I’ll stick with incandescents for floodlights. They are much cheaper, and last for years, normally. Yes, they use more power. But I don’t think they have a really reliable LED product yet.

BTW check packaging carefully. If it is tamperable, chances are some dishonest clown is going to be doing swapouts occasionally, at the stores expense. This was the case with one of several units I purchased. The plastic clamshell package has little ‘pegs’ which are easily and undetectably reclosable. I have a sharp eye, but this one fooled me at the store. Got it home and, under test, about 5 out of 20 of the clear plastic T1-3/4 size individual LED’s were clearly nearing end of life. They were noticeably dimmer, and their color had migrated off from white to clearly a more yellowish hue. You are only safe from this scam if the packaging features ‘destructive only’ style opening. In retrospect, I *might* have detected a small portion of the bozo’s fingerprint burned into the lens of that lamp. Maybe.

I am intrigued with these little 20-LED lamps, just the same. They only draw about a watt at 12VAC. I plan to build one or two battery operated ‘trouble lights’ for general purpose use around the homestead. And of course I have to incorporate a DC-AC converter to get the 12VAC needed to run them. I’ll also build in a 120 to 12V transformer to allow power line operation and charging of the battery.

Bear in mind that pretty much every kind of LED lamp uses digital switching technology to convert whatever supply voltage to the correct one needed by the individual LED(s). Digital switchers are notorious RFI generators, so if you happen to like to listen to AM radio or you are a Ham or CB radio type, these little wonders may prove to be a major RFI nuisance. To most folks, this is of no consequence, but to radiomen, it really matters.