Philips creates first LED incandescent light replacement

Be very interested to see if it produces a light quality even close to that of halogen. I doubt it will.

.. without tripping over in the dark! Brilliant!

Are the energy companies going to subsidise these as well?

Should I get on to my broker and splash out on shares in Philips?

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How many arms and legs will it cost? Does it take mains voltage? Is it worth chucking out a lower wattage cfl for? (Dimmable and instant on seem to be 'pluses' though.} Is it April 1 again?

Doesn't say halogen it says incandescent. B-)

Be interesting to see one in the flesh. I guess the CT is just a case of selecting the right phosphor(s) but I still have my doubts about light intensity and distribution. An incandescent bulb radiates fairly evenly in all directions apart from where the cap is.

All the "domestic" LED lamps I have seen so far have a very directional pattern and a horrible cold blue/white light.

Exactly my thought. That weird sci-fi blue is just tolerable in my 28 led torch.

I am surprised that the claimed 80% saving on electricity costs is exactly the same as the claimed saving for CFLs.

I thought LEDs were supposed to be an order of magnitude more efficient than CFLs.

So they cram masses of them in each enclosure, and we are back where we started...

Plus ça change, plus c'est la même chose.

Huh? Until quite recently white LEDs had a *lower* efficiency than CFLs (around 40 lumens/watt for LED compared with about 80 lm/W for CFL). I understand that an experimental 200 lm/W LED has been developed, but it will be a while before such a beast appears in a consumer product.

Richard.

They may be, but the circuitry to reduce the voltage may not be. That will probably improve in time.

I was giving them the benefit of the doubt. ;-)

Snag is the actual junction produces a blue light which is converted by the phosphors. So efficiency goes down as you 'warm' it up.

To keep the cost down they are made up of ordinary low powered devices which are pretty directional. But higher powered types which aren't do exist. And cost a lot more.

Is it not 80% saving over a CFL?

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dont think leds use phosphors.

They are very monochromatic. I would guess a warm light LED would use RGB LEDS and a frosted bulb to diffuse the light.

I recall that Cree were very hot about a decade ago ... looking at it again, I see that in the last year or so it has gone from $20 to $80, almost back to the heady dot-com level.

Wiki re white LEDs:

Phosphor-based LEDs

This method involves coating an LED of one color (mostly blue LED made of InGaN) with phosphor of different colors to produce white light, the resultant LEDs are called phosphor-based white LEDs. A fraction of the blue light undergoes the Stokes shift being transformed from shorter wavelengths to longer. Depending on the color of the original LED, phosphors of different colors can be employed. If several phosphor layers of distinct colors are applied, the emitted spectrum is broadened, effectively increasing the color rendering index (CRI) value of a given LED.

I don't think so, as it quotes the LED version at 12W for a 60W incandescent equivalvent.

SteveW

Ah...re-emmission.