From: Halvor (halvorb@mac.com)
Date: 07/11/02-08:24:06 AM Z
Right.
Hope I have the correct version :)
did compare those curves and this one showed best result for ferric (pt) but
that was between what was available in my local diy..
will see...
>
> Halvor,
>
> HID is an abbreviation for High Intensity Discharge. HID bulbs are
> made in sodium vapor, mercury vapor and metal halide. Only the last
> two types are useful as exposure units for alternative processes. As
> you note, HID bulbs are routinely available in configurations up to
> 1000 watts, and less commonly up to 4000 watts and above.
>
> To the best of my knowledge mercury vapor lamps are at least as
> effective as metal halide bulbs as exposing units for alternative
> processes. In fact the two types of bulbs are very similar in terms
> of spikes of radiation, so much so that when you look at the SPD
> curves for the two types you realize that the metal halide is really
> just a mercury vapor + lamp, with most of the + radiation in the
> visible light area not useful to alternative processes.
>
> As noted earlier, HID mercury vapor and metal halide bulbs are
> available commercially in ballasted luminaire units of up to 1000
> watts. Self-ballasted HID mercury vapor bulbs are available in up to
> 750 watt size, though many bulbs of this type appear to have a
> phosphor coating that shields UV light.
>
>
> Sandy King
>
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