HPS plus LED

I got a 4'b4' room with1000w hps.I want to add leds to cover the outside edges.

why not get some fluoros for the side lighting.

Its a great idea. You can use standalone modules or just add blues. These can't be beat
http://shop.stevesleds.com/Philips-Luxeon-ES-ROYAL-BLUE-3-Watt-LEDs-Luxeon-ES-Royal-Blue.htm