New style LED Light Bulb

Spotted this new style of LED light bulb in Tesco Hexham today:

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Price tag of £13 and not sure how bright (ha! dim) 250 lm is I didn't purchase but the design got me interested as most LED bulbs are very directional.

This looks like it might give a light distribution similar to an tungsten bulb. The one I examined didn't have the "crystal" defractor bit but a translucent tube with what looked like a conical reflector at the top end. Which is a bit odd as the barcode number between the one I saw and the one in the link above is the same.

Any one tried one? What is the light distribution like?

We have a couple of light fittings in a dark corridor that are essentially on 24/7. Think they currently use 2 x 9 W CFLs so cost about £23/year to run. So a couple of these would "buy" themselves in a couple of years. Assuming that 250 lm is comparable to a 9 W CFL. Trouble is a 20,000 hr life is about 2.25 years... Think I've just talked myself out of them for this application. B-)

Reply to
Dave Liquorice
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In article , Dave Liquorice writes

Thanks for the heads-up

For sparkling read glaring. Seems at odds with the warm and inviting claim.

Gasp, that's steep. I see they're claiming a whole 25W incandescent equivalence, so definitely not bright..

I make it 5,000 hours to break even with incandescent. Your 9W CFLs should be true 36W equivalent so these would be a bit dim. If you stocked up on 1quid (or cheaper) subsidised CFLs then I make the break even point 20,000 hours so no financial gain at all. Add to that that no Philips lamp I have ever used has reached their estimated life (especially the 24/7 ones) and it becomes a lose-lose situation.

I think you're wise to pass ;-)

Reply to
fred

Has anyone had an LED reach its claimed life?

Reply to
Dave Plowman (News)

Similar, but not the same. All non-filament bulbs seem to share the same large "blind spot" beneath the light source and above the bulb base. It's a much bigger unlit area and until they find a way of engineering this out, they'll never be a completely satisfactory replacement for filament bulbs.

Tim

Reply to
Tim+

Many still in operation for almost 50 years so I suppose some of them will ultamatly have a lifetime of 100 years or more if_you_don't_push_them, which is the issue of course.

Reply to
Graham.

In terms of this discussion LEDs haven't been around for 50 years.

Signal LEDs of course may have a (near) infinite life - but so do vastly under-run filament types. Things like the warning lights on a car dash.

Reply to
Dave Plowman (News)

I've had 60 white LEDs outside in a fake gaslamp for over two years, i.e. about 20,000 hours. The voltage was a bit high in the beginning, so some of them failed.

I now need two LED lights that run on 12 volts, radiate around 360 degrees, and can be switched to red or white. I suppose as usual I can't buy what I want so I'll have to cobble something up. (It's an 18 inch wide tail-lamp/headlight)

Reply to
Matty F

That is on the basis that electricity costs won't rise. And they will.

Reply to
harryagain

Why not install a PIR?

Reply to
The Medway Handyman

More of an issue is the controller that powers the LED. The lamp units all tend to run hot - at least 50C, and all controllers have to have large - read electrolytic - capacitors in them. No cheap electrolytic will do 20,000 hours at the kind of temperatures expected. The LEDs themselves have a known degradation rate at will last the course.

Andy

Reply to
Andy Bartlett

themselves in

That's what I thought. But at least the packaging of all bulbs now has a proper unit of light on it, rather than some useless weasel words marketing speak "60 W equivalent".

I need to make up a crib sheet of the lm's for 60W perl tungsten (my personal "base line") and a few CFL's and LEDs.

Spouting bollocks about the payback. You don't know what rate I currently pay, what rate I used for the cost calculation or if I'm on a variable or fixed tarrif. As it happens there was a 4.3p/unit difference with the cost calculation having the higher value and the tarrif is fixed until May '14.

Reply to
Dave Liquorice

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The one in that link would certainly be "sparkling" with that faceted defractor but the one I saw wasn't like that it was more like this:

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Except that the tube wasn't clear like that but frosted. I think it would give a much softer light source.

Reply to
Dave Liquorice

Still gotchas.

Two lamps - one 2700 the other, say, 4300. The 4300 will need to chuck out more lumens to have the same perceived brightness as the 2700. (Albeit 2700 almost always seems yellow and gloomy to me.)

Reply to
polygonum

Childrens "comfort" light at night...

Reply to
Dave Liquorice

Well I don't like lamps that are 4300 K, far too cold and harsh, so lamps like that don't even get a look in. I like the warm glow of

2700 K. B-)
Reply to
Dave Liquorice

Have to say, some 2700 rated LEDs are quite acceptable where none of the

2700 CFLs were. But in general I much prefer higher colour temperatures (given reasonable CRI). Think I'd actually choose somewhere around 3200 to 3700 for most environments. But in so many rooms, a lot of light is reflected from off-white surfaces, and this has quite an impact on perceived light.
Reply to
polygonum

That's what I sort of guessed. I've had two mains LED sort of explode. Given the cap ain't a user replacement, isn't it about time these extravagant claims about LED life were banned?

Reply to
Dave Plowman (News)

If you find an LED that truly gives the warm glow of tungsten, let me know.

Reply to
Dave Plowman (News)

They are still fiddling in order to get an omni directional light out of LEDs by the look of it. Interestingly I am confused by the apparently short life expectancies of leds. What are they do doing, in theory if run within their specs they should never wear out short of some internal mechanical or psu failures. Brian

Reply to
Brian Gaff

Livarno LED jobbies from Lidl (I think) aren't bad for colour temperature @ 3000 K and are normally an acceptable price. Not available in a GLS type light distribution though. I have one for when the 40W R50 tungsten spot fails in my desk lamp, it's had a "wobbly filament" for ages...

Another was in use as a trial/replacement for a R120 spot with other tungsten lamps. A pretty close match.

Reply to
Dave Liquorice

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