I use rgb led light strips and they work great. You can change the color of the lights which is cool. Just measure length needed for enclosures, cut, peel the adhesive backing off the back of the strip, stick to top of enclosure. Plug in ir controller and power supply. You can also go with a white light strip but you want to go with a 5000 to 6500k candle rating.
A waterproof kit like this one with ul rating runs about 58 bucks. You can find cheaper kits but they usually have sub par components. I learned this the hard way! I had a power supply burn out with a cheap kit.
Flexible LED Light Strip Easy-Plug Kit - SMD 5050 - Color Changing RGB -With UL Recognized Components