Interesting idea for back door - though reviews suggest it struggles in the 4 winter months Frostfire 16 Bright LED Wireless Solar Powered Motion Sensor Light (Weatherproof, no batteries required): Amazon.co.uk: Lighting
Evo36 Next Gen. Solar Powered Security Light £49.99 The Evo36 Solar Security Light has 36 LEDs and is brighter than any Solar Security Light we've tested or sold that retails for under ?100 (except the Evo56 of course).
Clip on Solar LED Light | Clip this Solar LED Light on your gutters, a fence or any flat surface. No wiring needed! It's the easiest way to Increase home safety & security without incurring electricity costs. Solar powered security light has 3 bright LEDs that illuminate dark areas dusk to dawn.