Blacking out windows for marijuana grow room

A question from a fellow grower:

Can you grow marijuana in a room without blacking out the windows?

A reliable light schedule is important for a healthy plant. To flower the plant you need 12 hours of uninterrupted darkness. You could cover the plant with a light proof bag or move it into a closet, but again you need reliability, and the plant needs to wake up and go to bed, so to speak, at the same time every day to avoid stress.

If this is not possible then you still have an alternative. An autoflower hybrid would be perfect. Autoflower seeds will grow and slowly, mature and flower in a relatively short period of time regardless of light schedule and so light schedule is not really important for autoflower seeds which of course you can find here Buy Feminized & Autoflower Marijuana Seeds Online >> ILGM