LED Bulbs Replacement

[Tim Streater]

Which inaccuracy was that then?

[Lobster]

Is that just based on purchase price of the lamps, or also factoring in the different electricity consumption over 25,000 hours?

[Dave Plowman (News)]

Read the whole post - that's why I snipped the bit I wasn't replying to.

[RJH]

snip

Insofar as you can tell, what's the cause and rate of failure?

Rob

[ARW]

About 1 in 10 fail in the first month.

They fail because they are shit and not enough people send them back to get replacements.

[The Natural Philosopher]

yoiu dint include electricity savings.

So if a 5W LED at £10 is equivalent to a 50W halogen at £1 the cost per hour of each is as follows.

Electricity Amortised cost total

Halogen 0.005p 0.05p 0.505p LED 0.0005p 0.04p 0.4005p

[The Natural Philosopher]

All mine are bang on (12v types)

The LEDs may be also

See previous post. bulb cost dominates the equation.

[alan]

They may well achieve the life expectancy if connected to a large heat sink and/or run in a well ventilated fitting. My experience with replacement LED bulbs, both branded and cheap from the far east, is they will start failing within 12 months, usually with one or more of the LEDs in the array going significantly dimmer. The bit of the bulb with the electronics will run hot.

[Terry Fields]

Well I'd gave to say that in Dave Plowman (News)'s contributions to this thread, he simply hasn't stated any facts, merely sniped at what he thinks are the drawbacks of LEDs.

At least I put up a detailed calculation, which so far hasn't been refuted.

I replaced my kitchen and utility halogens with 'white' LEDs, and I've go to say that it's a better light.

Like yourself, there's been a massive drop in electricity consumption, here it's

430W down to 36W.

Believe me, this is a major benefit!

[John Rumm]

As an experiment I replaced one 50W LR16 halogen on a 4 lamp tracklight with one of:

with a light meter shows that its actually slightly brighter than the (admittedly a couple of years old) 50W halogen. Colour temperature is very slightly higher. Hard to access the light quality as its currently working alongside real halogens.

[Lobster]

Yep sorry, saw that: actually I tried my post two minutes after sending it but doing so was evidently as ineffective as ever...

[Adam Funk]

(That's what I was wondering, especially based on ARW's & others' posts here.)

How long do the other 9/10 last? Are there better/worse suppliers of these things?