Step 2I use a MR16 bulb its the kind made for track lighting
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Next I use a MR16 (WITH THE LENS BUILT IN) bulb its the kind made for track lighting. I use 12 volt only and I like a 10, 15, or 20 watt bulb. You can get the 20 watt from HD for 4.95 the lower watts bulbs you need to get online from a lightbulb dot com place or a specialty light bulb store in your area. You will also need a MR16 socket that you get from a specialty place for $2.00 and a Conduit Hanger and 1/4 inch thumb screw to replace the screw that comes on the hanger (to make it easy to adjust or leave the screw on and crank it down and forget about it ) and a nut and bolt to hold it to the Body
Conduit Hanger w/speed thread size #0 3/8-1/2 5pk $1.90 HD
MR16 Bulb 20 watt Aprox $5.00 HD
Thumb Screww 1/4 " 3pk $1.29 HD
Lock nut (nylon insert) #10-24 4pk $1.29 HD
Bolt 1 inch long #10-24 4pk $1.29 HD
MR16 Socket $2.00
http://www.dealextreme.com/p/mr16-4w-4-led-6500k-360-lumen-light-bulb-white-12v-30208