Could use y'alls help! Light proofing my Cab!

Hey, What's good y'all? I'm in the process of setting up a cab to beat out the cold winters and give my crops a headstart. Some of my seedlings include tomotato, strawberries, and a small rubber ficus I'm trying to train to bonsai. Anywho, most of my set-up is complete. I'm having some brain block on how to light proof it from the outside. I have pictures to explain my issue.

I have a top that is removable off the shelf. I could easily solve the light issue by caulking along all edges of the top, but my dilemma is it makes it much more convenient to remove the top to access the lights, or pull 'em out and all that jive. I was wondering if anyone has any ideas for how I could still light proof it while leaving it removable. Any info. would be much appreciated. Mucho Gracias!

get that spongy weather stripping for doors from home depot.....just an idea....

Lowes and Home Depot are your friend man. They have reflective foil tape, insulation and materials to fill those gaps. But don't forget about air exchange/temperatures as you seal it up. Gotta be able to vent that box still.