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**To**:**aquatic-plants at actwin_com****Subject**:**Re: lighting****From**:**busko at stsci_edu (Ivo Busko)**- Date: Tue, 25 Jul 2000 14:41:01 -0400 (EDT)

A correction to my post: I stated that a change of one f/stop corresponds to a sqrt(2) factor in illumination. That's not true, it corresponds to a factor 2. I was using a combined f/stop-shutter speed table that has sqrt(2) resolution and that got me confused. It has been a long time since I did this... Anyway, this translates to a 20% accuracy instead of 10% for 1/4 f/stop increments. Still usable, but a lux meter would likely be better ! - Ivo Busko Baltimore, MD

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