When doing an OCLT, what is the recommended procedure as far as timing goes?
Specifically, do I test just after full sundown, when completely dark, or can I just do it right before bed? I go to bed around midnight.
When I test in the morning, do I test before dawn, so still dark outside, or do I test at dawn, or when the sun is actually becoming visible?
To recap in short order, the following questions.
1. How long of a time span, too long/too-short between the initial reading and the final reading? Night & morning.
2. When does UV hit the point, roughly, where it begins to consume CL in the morning, thus invalidating the test?