basement corner grow with 2 white plywood walls?

I'm gunna be growing some lowryders in a corner of my basement under a 400 watt hps. I am wondering if I should paint 2 large pieces of plywood white and prop them up to reflect light back at my girls. I am growing in a corner and the two basement walls are already white.

yeppers that is a great idea (I use cardboard) and something even Uncle Ben does

Or you could staple/tape mylar up on them. White paint would be sufficient though. Be careful to watch for mold on plywood, especially in a basement. They do sell white primer/sealer that would probably be ideal to maintain longevity. Also, I grow in a basement and run 2 dehumidifiers to keep my humidity between 40-60%. Something to keep in mind when you get to the flowering/drying stage (mold)