Thanks Becca. I didn't use any light for that first time period either. I just kept a black cloth over the shoe boxes until it was ready for light.You can leave it covered for now. Light isn't needed for a week after grain inoculation of the substrate while it colonizes, then 10 watts to 15 watts 6000K or 6500K LED light 10- 12 hours a day till end of 1st flush/1st harvest. A full cannabis grow lite will be too much and are usually a much lower Kelvin color temp around 3500k-4000k.
Shrooms aren't photosynthesizers. They just need the light to know up from down and the light cycle to know past from future.
Is that the 66Qt monotub in the photos?