Pasi, I'm not sure what your point is here.  Are you saying that I'm wrong?
 You don't need to check the light output with an LDR and a scope.  All
that will tell you is what the light is doing, not what effect it has on
the human eye.  And I speak based on past experience with stroboscopic
effects of various light sources.

Also, I'm talking about normal lightbulbs hooked up to straight mains
power.  Why are you introducing all sorts of variables like resistors,
diodes and triacs?  Read the original thread.


Martin R. Green
elimar@bigfoot.com

----------
From:   Pasi T Mustalahti[SMTP:ptmusta@UTU.FI]
Sent:   Thursday, September 18, 1997 3:02 AM
To:     PICLIST@mitvma.mit.edu
Subject:        Re: Multiplexing Seven Segment Displays [OT]

On Wed, 17 Sep 1997, Martin R. Green wrote:

> As far as lightbulbs go, they are not really affected by flicker because
> the hot filaments have a very long persistence.
PTM: Try this first. Take a Oskilloskope and a LDR. Speak after that.
I Tried myself with pulps with various wattage, with series resistors,
with series diodes and TRIACS.

Fluorescent lights,
> however, do pulsate in time with the AC frequency.  This is why those
> strobe rings on  LP turntables don't work with incandescent light.  You
> need fluorescent or neon illumination to set the turntable speed with
this
> method.

PTM: Try first, speak after that.

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