Hella lighting (4kq) -- cops search?

[isham-research.freeserve.co.uk at pop.pol.net.uk]

> Confuses me, too, however if Sodium lamps are good for certain
> "vegetables" I do know that most plants tend to respond well to yellow
> and near (but not actual UV, that's a killer!) UV light. Near UV light
> has lots of energy, but some it tends to get reflected by the blue in the
> chlorophyl, and Yellow is well absorbed by green (green is reflected,
> hence that why we see plants as green). So, it makes more sense for the
> Sodium lamps to be yellow, not "Sodium blue". IMHO, if they are blue,
> it's by tinting the bulb, which means lots of light get's filtered out
> and wasted.

'Lots'?

Ever looked at the spectrum of a sodium lamp?  The main line (actually
a twin line - good luck at splitting it) accounts for 98%(?) of the
radiated energy.  There are some other equally specific lines, and that's
it.  A _good_ blue filter would result in total darkness - a tiny
fraction of 1% would get through.

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 Phil Payne
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