New LED lightbulbs shine light in all directions

GE is going to be releasing a new LED lightbulb early next year that shines light in all directions, like a normal bulb, instead of one direction like they do now. The bulb will use 9 watts and shine as much light as a 40-watt incandescent. It will also last for 17 years.

The drawback is the cost, which will be $40-$50, but it does provide an efficient lighting option for those who don't like the light from CFLs.

No word about the blades on the side, however.


GE Unveils New Omnidirection LED Bulb That Will Last 17 Years

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I'd guess the "blades" are cooling fins, and I'd also hazard a guess that there is just a big emitter in the base and the "bulb" is nothing but a diffuser.
.  I have a hard time believing a 9W bulb would need that large of a heatsink ... but I can't figure out what else it might be. I wouldn't think the "bulb" part would require any more protection than an incandescent (probably less, since the LED bulb is probably some plastic) and, IMNSHO, it dang sure ain't for looks. Didn't see anything about it on the GE site, but I didn't dig very deep.
 LED's get pretty hot
kelseymh jj.inc7 years ago
What LED's are you thinking of?  Certainly not the little ones used in flashlights or Christmas lights.
jj.inc kelseymh7 years ago
 There was another instructable about building an LED projector and it required heat syncs, but I guess it was 20w, and these are small. I wonder if it is oil filled to make better contact with the heat syncs and stuff, I heard about stuff like that a couple of months ago. 
kelseymh jj.inc7 years ago
Ah, yes.  I saw the picture of the 20W LED on that projector I'ble, and those are huge heat sinks ("sink" as in water down the drain).  I'm not sure that's for the LED itself, or for the voltage regulators. 

When you drop something from 8 or 9 down to 5 V, at the same current, the extra power still goes into heat, so regulators usually have some honkin' heat sinks attached to them.
IMO, they are more about giving the bulb a unique image than functionality.


.  I was in my local Wal-Mart last night and passed by the lamp section. Thought about this topic and did some digging. Found some replacements for incandescent lamps. They had rather large and massive heatsinks on them. None of the "curl around the bulb" stuff, but heavy, metal fins at the base.
.  I'm guessing that there's just not a good way to drop mains voltage to LED level without a lot of loss. If so, in the future, it might be advantageous to have one large low-voltage power supply for lighting (especially in buildings that require lots of and/or 24/7 lighting).
So much heat generated... are they still lower energy consumption than other lighting systems?


.  BTW, the prices on the lamps ranged from just under 30 to over 40 USD! Too big an up-front cost for me; CFLs are pretty cheap nowadays.
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