The original lights were flourescent and quite badly fitted. They made a lot of buzzing noise and the bulbs didn't seem to last very long. I got fed up with them and decided that replacing them with LEDs was the way to go. My budget was small so I didn't want to buy expensive designer lights.
To add interest and a bit of practicality, I decided to add a fade-up effect when the lights switch on and have a half-bright mode for those special occasions where dimmer lighting is required.
Step 1: LEDs
You want 5050 LEDs, preferably 3 to each 5cm / 60 per Meter, waterproof (they are covered in a flexible clear plastic and with a adhesive backing.
I got a 5M strip plus power supply from a seller on eBay. Total cost was UKP 50.00.
The LED strips can be cut every 5cm (or 3 LEDs) and are very bright. 5M of LEDs consumes approx 3A (36W at 12V). This is less than the 4 flourescent strips they are replacing.