I find my shrimp will molt anytime, so during the "night" isn't really something I've seen as a hard rule.
Shrimp don't sleep, so you don't have to worry about disrupting them that way. If you have some plants in the tank, stick with a planted schedule. If you want to be able to see your shrimp with the lights on, work your light schedule around your work schedule so the lights are on when it's the best time to watch your shrimp.
Amount of light also plays a big role. 8xHO lights will create algae without plants, etc. 1 CFL bulb suspended above the tank could be on pretty much all day long with no effects.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
Sump Pimp #2
My Tanks and my shrimps