Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Effect of different sampling intervals on (a) hours spent in bright sunlight, (b) cumulative outdoor exposure, and (c) total cumulative light exposure. Dashed lines indicate ± 5% of the original values for a 10 s sampling interval. The different grayscale symbols represent three different subjects.
