[argyllcms] Re: Absolute light meter calibration?
- From: Jean-Pierre Vial <vialups@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 13 Aug 2015 21:57:49 +0200
Le 13/08/2015 18:43, Ben Goren a écrit :
That's why I'm thinking that lamp black might be a good choice. (Hold the
filament over a sooty flame until the filament is evenly and thickly covered
in soot. Would require a good vacuum else the soot would combine with air at
high temperatures.) At the least, lamp black is within shouting distance of a
black body in the visible spectrum, and I _think_ it's equally black across
the whole spectrum -- but that's something I'd need to confirm.
A much simpler solution in this line would be a lamp with carbon
filament (like the fist electric lamps in the 19e century). You can
still buy them for a very moderate price (less than 10€), they are sold
as decorative lamps.
Problem: 2200K only.
Maybe a little more by over-voltage, with shorter life. If you want to
try this, be sure to order several, because you will kill two or three
while looking for the best compromise.
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