Step 1: What You'll Need
Soldering iron & solder
Jet flame lighter
Hot glue gun
Standard frosted bulb, bayonet cap BC(frosted glass as opposed to powderd)
Low voltage halogen reflector bulb (the smaller the better)
AC/DC mains adapter of about same voltage as halogen buld with wattage a bit below that of the bulb
Step 2: Open the Bulb
Ease the cap open DO NOT JUST PULL it off, it should still be connected by two thin wires cut these with scissors near to the top and leave connected to the base.
Step 3: Breaking the Glass
The best way I have found to do this is by using the cutting disk on the dremel to press lightly onto the glass surface to leave a mark, keep it there and a crack should appear. Using the cutting disk you can extend and change direction of the crack until it encircled the bulb and the top comes off.
Step 4: Dulling the Edges
Now the top of the bulb is off you probbily not want sharp edged on it so take your jet lighter and the edges until they go clear. this has the added bonus dof making the edge slightly thicker and less likely to break.
I tried doing this with a small blow torch but the flame was too hot and caused the glass to shatter so i returned the my lighter.
Step 6: Breaking the Halogen Light
Because of the thick glass used in the reflector breaking requires some force. To stop shards of glass flying everywhere I thought it wise to put the bulb in a plastic bag, which i proceeded to crush in a vice. Remove the hopefully unscathed bulb from the broken shroud, you may need to use some pliers to break off some of the glass that is held to the bulb with the white ceramic cement.
Step 7: Connecting the Bulb
Step 8: Sealing It All Up.
Step 9: The Desk Lamp
Next i cut the existing lead off the lamp and attached the connector for the AC/DC adaptor and hot glued it into the gap the cable ran into.