You can get very high efficient LED strips from various manufacturers.
Depending on your space I would look at 4ft or 2ft strips and put one close to all four walls.
Maybe google LED gardener strip builds , I would consider something you can run on aluminium angle as heatsink to keep cost down.
Something like bridgelux eb series gen 2 or 3, or cutter.au do some nice cree J series strips that you can thermal glue or tape to U shaped aluminium angle.
Obviously it depends on how much you want to spend to supplement but above would be the cheap way of doing it.
You can spend a good chunk on various more expensive options, like cutters boarder riders for example.