Todd George noted

Cheap white LED strips in large quantities available via eBay!

But there are several variables 1) how many emitters per inch. The more the merrier 2) what color? 2700K cool white is the most popular LED but perhaps a warm-white around 3500K would be better for those with the yellow slide rules. alternate sources: Ikea has clever LED lighting but not as many emitters per inch. Staples sometimes sells locker LED strips. Battery powered!