Tungsten bulbs on the World Service.

[The Natural Philosopher]

Er no. LEDs come on instantly, dont age so much, have a far better color temperature and seem to be brighter.

I hate CFLs, I like incandescent and I love LED.

[Chris French]

I was talking about (as was pretty obvious from the context of the rest of the post that you snipped) the comparative efficiency of the different sorts of bulbs.

There are of course other benefits to LEDs

[Johnny B Good]

This is *the* key advantage of 200Lm/W over the existing 81 to 100 Lm/W LED lamps. It's not just that the 8W input energy produces twice the light, it's also the fact that less of that 8 watts represents waste heat energy (about 6.8 versus 5.6 watts for an 8 watt lamp). A new 8 watt "80W" LED lamp will run cooler than an old 8 watt "40W" LED lamp.

[tabbypurr]

though that's largely true because they don't choose to spend a penny more to make the ballast fit for hotter service.

NT

[Dave Plowman (News)]

It's more the obsession of having a self contained unit the average user can swap for a tungsten. If they used the same principle as low voltage tungsten - a separate power supply - the problems could be solved in a stroke. And the same applies to fluorescent.

[polygonum]

Which seems to be hit right in the head by "dont age so much". The Wiki figures can be argued about forever, but CFLs seem always to follow a depressingly steep reduction of output. However close CFL and LED may be at the start of their lives, it doesn't last. So the comparative efficiency ends with LEDs winning by even more.

[tabbypurr]

That's one solution, which hasn't worked at all well. Another is use bigger transistors & capacitor. They're just being cheap.

NT

[tabbypurr]

IMLE LEDs age badly, worse than CFL.

NT

[The Natural Philosopher]

Then they are probably cheap ones that are being grossly overrun

[Johnny B Good]

I agree with you but the "Problem" the manufacturers are addressing *is* exactly that "obsession" with "direct drop in GLS replacements", hence the current best maximum of 1500Lm 18W LED lamps that can only be fitted in well ventilated luminaries if they're not to succumb to premature failure from heat stress.

The advent of 200 to 300 Lm/W lamps promised by the lab examples first seen almost 2 years ago will rather neatly solve that issue and it's no bad thing that we'll be able to make even further, if rather modest, savings on our electricity bills.