Water Bills
 

Fwom:Mike )
Newsgwoups:uk.d-i-y
"N. Thornton" wrote in message
m...

re lighting pir:

Screwfix Tlc or Toolstation do a mini round blob one that looks
much
better.

Not quite that pretty though, is it :-)

no, its as good as Ive seen though. Maybe one could stick such a PIR
unit inside a recessed light fitting, instead of the bulb etc. Not
tried it, and not sure if one could make it look good or not.


Replacing halogens with CFL recessed downlighters would also save a
lot.

I'm waiting on those a little longer. I believe the price should
plummet
shortly so will buy them then.

At £24 a fitting you might not save by waiting, considering the run
cost of halogens. Lets see:

Halogen run cost per 2000 hrs:
bulb cost 80p - £5
leccy cost 200kWh @7p = £14
total £14:80 - £19.

CFL run cost per 10,000 hrs: (5x above time)
bulb cost 2.99
leccy cost 26w 260 kWh @7p = £18.20
total £21.19 per 10,000hrs
= £4:23 per 2,000 hrs.

Saving: £14:77 to £10:57 _per light fitting_ per 2,000 hrs use.
I forget how many fittings are in use.


NT

N. Thornton wrote:

Fwom:Mike )
Newsgwoups:uk.d-i-y
"N. Thornton" wrote in message
m...

re lighting pir:


Screwfix Tlc or Toolstation do a mini round blob one that looks

much

better.


Not quite that pretty though, is it :-)


no, its as good as Ive seen though. Maybe one could stick such a PIR
unit inside a recessed light fitting, instead of the bulb etc. Not
tried it, and not sure if one could make it look good or not.



Replacing halogens with CFL recessed downlighters would also save a

lot.


I'm waiting on those a little longer. I believe the price should

plummet

shortly so will buy them then.


At £24 a fitting you might not save by waiting, considering the run
cost of halogens. Lets see:

Halogen run cost per 2000 hrs:
bulb cost 80p - £5
leccy cost 200kWh @7p = £14
total £14:80 - £19.

CFL run cost per 10,000 hrs: (5x above time)
bulb cost 2.99
leccy cost 26w 260 kWh @7p = £18.20
total £21.19 per 10,000hrs
= £4:23 per 2,000 hrs.

Saving: £14:77 to £10:57 _per light fitting_ per 2,000 hrs use.
I forget how many fittings are in use.


Additional gas bill per 2000 hours to replace lost heat? probably about £5

So £9.23 per 2000 hours in reality.


NT