you have 12 hours of light. that's plenty of time to tend to a 30-40 plant garden.
you should be able to tend to your girlies fine during light periods. it's a matter of scheduling.
schedule the light period for times youll be at home. it's a bit of a pain in the ass to come home after a long shift to get home to get to work on your plants, but if it was easy everybody would just grow, instead of having a dealer. i used to work late late nights, and i would come home to have to work on my two plants (completely sucked). i had to set the timer so lights on was at 330am every night, cuz i went to work at 5pm give or take, and would not get out til 2-3am (worked at a club, anybody notice?)
the plants don't care about the planets rotation, distance from the sun, or other meta-physical bullshit....
so next time try to schedule the light period for whenever YOU can tend to your plants. a 4-5 plant grow that's going smoothly shouldn't take more than 20-30 mins to water, feed, trim, clean-up, but you gotta do it without procrastinating....
but if you absolutely MUST go into your grow room during the 'dark' period and really don't need TOO much light then use a green glowstick.
they're cheap and weak enough that they won't harm the plants.