i need an advice on lamps for high speed switching

hi!
i wanted to build a light righ, but the normal light bulbs are slow and don't las very much with constant on/off...
I thought in leds, but they lack of luminosity and size...
So i wanted to know, what kind of lamps, or something you would advise to me.

Now a days Ultra Bright White LED's are available in the market which has luminosity comparable to torch bulbs. If used in groups it can give light equivalent to a normal light bulb. Use these LEDs for your purpose but let me tell you one thing, since these LEDs are introduced recently the cost of LEDs is a bit high. Try www.nteinc.com for more information.