Thread: Light Pollution
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Old 27-03-2006, 23:55   #32
Neil
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Re: Light Pollution

Mercury vapour are also white. I think they are very similar to the newer metal halide ones. I think the old orange street lights were a very efficent type of low pressure sodium but not nice to look at. The modern high pressure sodium (HPS) lamps are more yellow and are often used as motorway lights. You can also use high pressure sodium lamps for growing plants as in this example I found on the net
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