We've done CFL's , what about LED's ?

[Dave Plowman (News)]

No, pet. Experience.

[Dave Liquorice]

You don't have to wait it's already happened. The Great Unwashed have effectively cleared Tesco Carlisle 2 of all but a handful of 40W tungsten lamps.

I was looking at the them and the CFLs today in relation to the claimed outputs and the ASA. The 11W CFLs have "light output similar to 60W" or words very close, no use of the word "equivalent". They claim 640 lumen for the CFL in a little diagram with a tungsten lamp showing 610 lumen. The words mention "white soft tone" for the type of tunsgten lamp in the comaparison. There were just a couple of 60W white soft tone bulbs on the shelf, they claimed 700 lumen, Ah! All Tesco branded as well...

Can you file an ASA complaint online?

[Rob]

I stayed in a posh hotel the other week (so a completely unfamiliar environment) and the bedroom had LED reading spotlights to the side of the beds - I thought they were superb. Fluffy towels a hoot too.

ATM I use 20W halogen lamps for reading and so forth, and I'd certainly try a LED replacement as and when.

I also like CFLs - but not for actually seeing anything in detail. Good for table lamps in the corner of a room.

But as you say, a lot of people seem to have made up their minds about what's best.

Rob

[ARWadsworth]

The Phillips 11W CFLs give 600 lumens. No reference is made to soft tone lamps but instead refers the user to IEC 969

Yes, just fill in the Online Complaints Form

Adam

[ARWadsworth]

Just checked, Phillips soft tone 60W lamps are 700 lumens.

Adam

[The Medway Handyman]

He probably can't see if he's using those poxy bulbs.

[The Medway Handyman]

Oh FFS. Can you not just answer a question.

[Clint Sharp]

It can do, I have a light built on breadboard that uses a small microprocessor to control the brightness of each individual LED of an RGB LED. It wasn't built to be a white lamp but it works quite nicely as one.

[Bruce]

He probably thinks he just did.

[David Hansen]

On Thu, 08 Jan 2009 20:44:25 GMT someone who may be "The Medway Handyman" wrote this:-

There was no question to answer, just an assertion.

Nice try.

[Dave Liquorice]

Battery operated:

mains:

stupid website doesn't give the direct URL. Lefthand end middle row.

[The Natural Philosopher]

I've noted a strong Initial resemblance to Dick Head in his postings.

[whisky-dave]

I like LED's, I've got 77 on my bedroom ceiling.

[PCPaul]

The latest thing I heard was that brighter, more efficient LEDs could be made in the UV range, then put a globe round one of those with uv-EXCITED RGB phosphors to make a 'pleasing' white light.

[Bruce]

One way or another, someone is going to make LEDs work as a full spectrum light source. It's only a matter of time. The potential energy savings are too good for it not to be done.

[Adam Aglionby]

Tends to look very blue without some adjustment, colour temp tuneable tend to add amber into array as well. Just about anything involving mixing LED colour is covered by US Patents granted to Color Kinetics , now part of Philips SSL. meaning Europe has much better range of LED products than the US.

Adam

[unopened]

Yup. Somebody has.

a blue LED with quantum dots and get a 'full spectrum' visible light source.

Linked article has spectra illustrating the differences in the output of:

Hybrid Quantum Dot LED White LED Fluorescent Tube

100 Watt Light Bulb Sunlight.

Of course it's only in the lab, but it seems to show promise. Unfortunately, cadmium is not the most benign of substances to have knocking about - but then again, neither is mercury.

Cheers,

Sid

[dmc]

Is that what they were showing on the BBC news the other day? Something about a new sort of energy saving bulb that only used 4W and was equiv to something like a 60W.

Available "soon" they said...and then didn't explain it at all

Darren

[Dave Plowman (News)]

Snag is the efficiency goes down as the spectrum gets better. I'm not sure if the potential efficiency is going to be better than CFL, like for like.

[Huge]

Of course not.

(The hypocrisy of 'Dynamo' Hansen bleating about proof by assertion, is amusing, though.)