Date: Thu, 20 Mar 97 07:05:03 EST From: Carlstrom_Rick@amelnx.advmar.com To: cp@opus.hpl.hp.com Message-Id: <aabcdefg1008$foo@default> Subject: More on Lights
If you are looking for a comparison of florescent to incandescent
on a light output per watt basis many home improvement stores have a
table that explains this. I thought the rough conversions were 17
lumens/watt incandescent and 60 lumens/watt florescent. These are off
the top of my head and may be wrong.
Another problem with the perception of brightness is the
distribution of the light. The florescent's light is distributed
evenly over a the tubes length. The incandescent is basically a point
source. At that point it is brighter but the overall light output is
less.
To go to an extreme example I saw a demo in my office of a military
microwave powered lighting system. It consisted of a magnetron, like
in a microwave oven, that irradiated a capsule containing a gas
mixture. The thing projected the light into a tube about a foot in
diameter an several feet tall where it was diffused out the total
surface of the tube. It put out the equivalent light of 500 100 watt
incandescent bulbs. However, since the light was even distributed
over the entire surface you could stare at the light an not hurt your
eyes. It was also very efficient, low in UV and IR and put out a very
"white" light.
Rick
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