Light bulbs

[Mr Pounder Esquire]

The ceiling mounted light fitting in my computer room has 3 Halogen R50
spotlight bulbs which get insanely hot and do not last too long.
As each one blows, is it okay to replace with an LED or do I need to replace
the lot?

Taa

[Caecilius]

I think that depends on whether the remaining halogen bulbs would
cause the LED bulbs to heat up significantly. Running hot reduces the
life of the LED bulbs.

[Unknown]

Caecilius pretended :

> I think that depends on whether the remaining halogen bulbs would
> cause the LED bulbs to heat up significantly. Running hot reduces the
> life of the LED bulbs.

+1 If they are reasonably well ventilated - no problem.

[Martin Brown]

The heat from adjacent halogen lamps will cook the electronics of LED
lamps. You are better off swapping them all at once.

Beware that some fireproof ceiling fittings designed for halogen lamps
to prevent them setting fire to your house will reliably kill LED lamps
stone dead in short order. The insulation to prevent then catching fire
traps the small amount of heat from an LED bulb and once it gets over
boiling point the capacitors have a very limited lifespan.

You may be better off swapping to a luminaire designed for LED.

--
Regards,
Martin Brown

[Mr Pounder Esquire]

There is plenty of ventilation.
I'll use up the spare bulbs and then replace the lot with LEDs.
In my younger days I could easily swap the 13 year light fitting for a new
one, but now I'm old and getting done.
Thanks for the advice you men, much appreciated.

[Rod Speed]

Mr Pounder Esquire <MrPo...@RationalThought.com> wrote

I'd replace them all at once myself so the new led doesn’t get cooked by a
halogen.

[Peeler]

On Mon, 18 Oct 2021 03:59:02 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin's latest trollshit unread>

03:59 in Australia? And it's trolling time for you already, you subnormal
piece of senile shit?

--
Website (from 2007) dedicated to the 87-year-old senile Australian
cretin's pathological trolling:
https://www.pcreview.co.uk/threads/rod-speed-faq.2973853/

[The Natural Philosopher]

If not on dimmers replace as they blow



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Sir Roger Scruton

[Fredxx]

On 17/10/2021 16:33, Mr Pounder Esquire wrote:

These are 230/240V and so no reason why you can't replace one at a time.
The only proviso is if the heat of one will transmit to the others. LEDs
will last longer if kept cool.

Personally I would replace all 3 at the same time so they match. Perhaps
that's my OCD.

[Jim GM4DHJ ...]

On 17/10/2021 16:33, Mr Pounder Esquire wrote:

all shops are selling them off for peanuts so just stock up

[Unknown]

Jim GM4DHJ ... explained on 18/10/2021 :

> all shops are selling them off for peanuts so just stock up

Quite true, the cost of some LED lamps is approaching that of the old
filament lamps. If these lamps are used much, it can be worth swapping
them out, if you can buy LED replacement cheap enough and to save on
the power bill.

[Brian Gaff (Sofa)]

Exactly why do halogen seem to cook themselves far more than the old just
filament bulbs did?
My only reason for not going led, apart from the fact that it will be
mainly for visitors benefit, is that so many LED devices have such crap
switch mode psus in them that they are like little radio jammers and as one
of my hobbies is listening to radios from afar, I have enough trouble with
the neighbours ones!

Brian

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[Unknown]

Brian Gaff (Sofa) submitted this idea :

> Exactly why do halogen seem to cook themselves far more than the old just
> filament bulbs did?
> My only reason for not going led, apart from the fact that it will be mainly
> for visitors benefit, is that so many LED devices have such crap switch mode
> psus in them that they are like little radio jammers and as one of my hobbies
> is listening to radios from afar, I have enough trouble with the neighbours
> ones!

Halogen run much hotter than the usual filament lamps, often there will
be multiple halogens, rather more than other types of lights - so more
lamps, more chances of regular failures.

[Mr Pounder Esquire]

Thanks for all the help You Men.
I'm gonna change all the lights to LEDs now.

[Martin Brown]

On 18/10/2021 10:18, Brian Gaff (Sofa) wrote:
> Exactly why do halogen seem to cook themselves far more than the old just
> filament bulbs did?

Physically smaller and run the filament much hotter so that a quartz
envelope is needed and the halogen can scavenge tungsten off it and
diffuse back to the filament where it is redeposited on the filament.

They have a bad tendency to explode if you contaminate the envelope with
sodium from a fingerprint. The sodium lowers the melting point of the
quartz envelope and begins an inevitable degradation.

> My only reason for not going led, apart from the fact that it will be
> mainly for visitors benefit, is that so many LED devices have such crap
> switch mode psus in them that they are like little radio jammers and as one
> of my hobbies is listening to radios from afar, I have enough trouble with
> the neighbours ones!

You can probably find ones that are more RF friendly. Try Philips for
example - not the cheapest around but probably one of the nicer ones.

Some older LED lamps are little more than a simple rectifier and a very
long chain of LED dies I doubt if they generate any RF interference.
They are however rather prone to single point failure when the weakest
LED in the chain dies prematurely. You may need to do some homework to
find which ones are best for radio hams (other hams for example).

--
Regards,
Martin Brown