On Thu, 15 Mar 2007 21:54:11 +0000, John wrote:

In article , David Hansen
writes
On Wed, 14 Mar 2007 18:53:59 +0000 someone who may be John
wrote this:-

What are we meant to do with all the security lights where CFLs won't
work?

I doubt if linear halogen lights will be eradicated in the short
term. However, low powered dusk to dawn lights are better at
deterring criminals.

I walked to the station this morning and counted 8 security lights with
filament bulbs - you know the bulkhead or carriage lamp with PIR type
and a further 26 front door/outside lights none of which could take a
CFL. I didn't observe any with a CFL or which could readily take a CFL.

At my Church I have changed every bulb I can to CFL, but there are still
about 25 spot lights which I can't replace the standard PAR(something)
with a CFL and get the same effect, nor the three bulkhead based PIR
security lights - I tried and it went phut and sulked until it had a
real bulb!

I realistically can't see filament lamps being replaced in the near
future for such applications as theatrical spots, floods and so on,
which require almost instantaneous turn-on (stage dimmer packs use
pre-heat to keep the lamp 'almost' on until it's required).
LED lamps approaching anywhere near 1 or 2 kW 'equivalence' are surely
a long way off.
How dimmable (properly) are LEDs?

--
Frank Erskine