On 5 Feb, 15:56, "mark" wrote:
With all the recent talk on light bulbs, here is a low energy light bulb
with no mercury and its clever.

http://girtonlabs.googlepages.com/sensebulb

mark

I followed this through a number of websites and found the whole topic
very interesting.

What I hadn't realised, if you google on Luxeon, is that they now have
LED's that are taking 1A plus. A quick run down some of the spec
sheets, then lead me on to find out how many lumens an incandescent
bulb produces as typically some of these high power leds are producing
170 lumens at 700mA. I found out from Wikipedia that a 100W bulb
produces 1700 lumens which means that a led equivalent requires 10 of
these leds which is 7A typical - OK this is at a couple of volts so
the power is quite low, but it does mean that we are going to have to
face some pretty powerful switching transformers (more electronic
noise) scattered around our houses, and what is more of a concern is
that we will have to rewire with automobile grade wiring - low voltage
insulation but lots of copper !!

As usual, we do get nothing for nothing and it's all very well the
pundits telling us that the next generation of lighting will be the
ultimate solution in terms of cost and efficiency but as is all too
common the whole picture has not been presented.

Rob