Multiple on and off per day - security light - which type of bulb?

I've certainly found CFLs don't last at all in that situation, I've just fitted an LED, but it is too soon to tell yet, but then again, as the LED bulb was only about £2.50, I'm not going to lose any sleep.

I'd imagine LED *should* last quite well, though.

Should be, and it may help if you can adjust the PIR for a maximum on time.

Owain

En el artículo , David escribió:

Try "rough service" bulbs.

David was thinking very hard :

In principle, they should fare much better in on/off use. I used to leave CFL's and filament lamps on if I would need them on again soon, LED's I simply switch on as needed.

LEDs shouldn't be worried by being switched on and off. But you may well have to change the fitting for an LED one, as the electronic switch may not work with the lower load.

Most tungsten have a life of approx 1000 hours. And unknown makes could be very much less.

Many do quote a max number switching cycles, e.g. Philips 30K cycles or

How come indicator bulbs on vehicles last a long time?

Bill

'anglepoise' type lamps on workbenches etc often operated from a step-down transformer, partly for safety and also because the bulbs were much more robust.

Owain

They don't.

I doubtr whether thjeir total on time is much more than a few hours

Bill Wright explained :

Lower voltage, thicker and more robust filaments and not in use for many hours. There again, not many drivers use them anyway :-?

LEDs are the right type here. But you'll need to try one to see if the PIR is ok with them.

nonsense.

NT

Most of the time LED should be OK, I'm surprised about CFL though. Both halogen and filament bulbs are filament based in the main and the thermal shock is the killer unless they can be under run volts wise. Could also be the environment of course, sealed up and getting hot and cold etc. Brian

CFLs should, in theory not die unless they are really poor quality like those free ones we used to get from leccy companies where the electronics were cheap and the rest probably just the same. I have found that leds do fail but a lot of them now seem to be pulsed at a high current to presumably look brighter, so don't know whether steady state or pulsed would last longest. Brian

"Brian Gaff" wrote in news:onf3hv$8oq$ snipped-for-privacy@news.albasani.net:

CFLs do not perform well in the cold.

Which part didn't you understand? Or just all of it?

Many more specialist lamps have an even shorter life.

They'd be pretty useless if outdoors on a cold day when fed from a PIR.

I understood it fine

yep. Of course we don't see too many 6 hour photolights now.

NT

Given they tend to be designed for 230V, rather than our 240V mains that wouldn't surprise me.

snipped-for-privacy@gmail.com expressed precisely :

You are WRONG..

Often the cheap imported lamps are intended for 230v ad don't usually survive long on our 240v. I have come across numerous instances of thisand on checking when they have failed quicker than expected - 230v.