10 Nov
2011
10 Nov
'11
12:14 p.m.
I don't beleive there is a suitable
alternatic [to incandescents] for
_all_ applciations.
Of course not.
1) Over my lathe (I am worried about flicker,
perhaps unnecessarily)
Probably. I'm reasonably sure modern fluorescents, including CFLs,
flicker at multiple KHz, not at 50/60 or 100/120 Hz.
2) In my copyling stand (You can't get a
continouls spectrum from any
CFL that I've seen, so using them a a light source for colour
photogrpahy is a non-staeter)
Well, possibly excepting some special applications, yeah. 3) In the white light source in the darkroom
(CFLs have a long
afterglow [...]).
Just recently I got some white LEDs. They're supposedly
high-brightness, and they aren't kidding; I (conservatively) hooked it
up to 5V with a 1K resistor and got a "that's _bright_" light. Then I
from the local 'pound store' (said light
contaiend 24 such LEDs, I've
never seen them at anything like that price in an
electronics catalogue).
Anyaay, I took one of the LEDs, touche the appropraite wire on one side
of a 9V battery and completed the circuit by holding the other ELD wire
in one hand touching the other battery terminal with my other hand. In
other words my had-to-had resistance was the LED series reisotr. The
result was a definite glow from the LED. Not bright, but certainly visible.
[1] This was for a classic-computer applciation. I'd rewound the motors
in an HP9125A plotter (for the 9100 calculator) and wanted to check the
voltage-seped characteristics.
Its spectrum was pretty close to continuous, based on
a DVD used as a
Interesting. That might negate what I said above. I am going to have to
try thenm as a photographic light source.
-tony