"Jeff Liebermann" wrote in message
...
On Mon, 7 Jul 2008 01:28:51 +0100, "Arfa Daily"
wrote:


OK. The bulb does not claim to be a halogen type. It was sold as a 'bog
standard' light bulb. It looks like a standard light bulb. It is stamped
60
watts on the packet, and on the bulb itself.

Does it have one of these labels?
http://www.energysavingtrust.org.uk/energy_saving_products/other_energy_labels/the_eu_energy_label/
http://www.thelightbulbshop.co.uk/EnergyLabels.htm
If so, what are the numbers? We don't have anything similar in the US
so it would helpful if you could supply the numbers for an "ordinary"
light 60w bulb. Note that halogen are in class "D" while ordinary
bulbs are "E" or "F".

However, it
has one major difference in that instead of the glass envelope being the
size of a tennis ball, it's more like the size of a pool ball.

Could I trouble you to measure the approximate diameters? I want to
calculate the relative surface areas.

--
Jeff Liebermann


The things I do for science !! I just had to rootle thru' the workshop bin
to locate the bulb which caused all the trouble in the first place. It is
clearly marked 60 watts, and has a CE approval also. I can't tell you what
the energy rating letter is, as I don't have any more on the shelf. I have
two other types from the same stable, and one of the boxes has an energy
rating on it, and one doesn't, so I'll have to look next time I am in the
store.

OK. On the diameters. Consider them for all practical purposes, to be a
sphere. The old was 60mm almost exactly, and the new, 50mm almost exactly,
measured with an electronic calliper, so reasonably accurate figures.

Arfa