[pure-silver] Re: Watts and light
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 10 Mar 2005 19:05:06 -0800
Speaking of lights, I have to share this.
http://www.lafterhall.com/hurrellstudio.html
Awesome.
----- Original Message -----
From: "Georges Giralt" <georges.giralt@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, March 10, 2005 11:10 AM
Subject: [pure-silver] Re: Watts and light
> Gene Johnson a écrit :
> > A Watt is a measure of power consumption, not light output. Measure
light
> > in watts at your own peril. Like Jim said (I think) "use a meter, get
your
> > answer"
> And bear in mind that light power output is not a linear function of
> electrical power input. I've long forgotten what I've learnt pertaining
> to this subject, but a search in you favorite's catalog of lamps will
> prove it.
> Of course, if the 2 500 W bulbs are the same, and you measure the light
> output of one, when switching the 2 you will have twice as much light
> output.... Replace these 1000 electrical W by one bulb of 1000W and your
> light meter may show a difference in light output.... (you may find more
> or even less light !, so trust the peacemaker, your fine, trusty luight
> meter....)
> Oh, BTW,yesterday we had a studio set with my fellow photographers, and
> the strobes where measured by 5 different meters (4 Sekonics, identicals
> models, age and wear, and my pour's man Polaris.) The Sekonics gave a
> full stop discrepancy between the more and the least optimistic. My
> Polaris gave the average value of the Sekonics ! So I can conclude that
> it is worth 4 Sekonics :-) )
> --
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>
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