/diy/ - Do It Yourself

>found a couple of SLA emergency lamps with toast batteries
I have a few questions:
Will soldering a leg back onto a small halogen bulb cause it to crack or explode?
Do I have to use a bulb of a certain voltage, or does only wattage matter? (This bulb is 6 volts, 10 watts).
Is there a high-output LED that will take 6+ volts DC so I won't need a driver?