On Jun 22, 11:11*pm, "Dave Plowman (News)"
wrote:
In article ,
* *Calvin Sambrook wrote:

The other trick which allows the use of such bulbs with these devices is
to wire a resistor in parallel with the bulb holder. *The resistor gives
the 'not in use' resistance formerly provided by the bulb.

Snag with that is it will waste energy when the thing switches on.

Lets see
The options:
1. filament lamp - much worse energy wise, maybe 45w wasted
2.CFL with R, 1w wasted
3. CFL with no R - same energy waste when off, no waste when on
4. PIR with relay & CFL - same energy use when off, 1w lost in the
relay coil when on

The only way I see to improve on the loss of a resistor is to fit a
capacitor instead.


NT