Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
You'll have to do some research, I don't believe the individual bulbs have built-in voltage regulators for the full 10 to 30 volt range, lamp clusters/assemblies do.
First image shows the LED replacement for the 1156 bulb, which is 12 volts. A 100 Ohm/10W resistor was needed to make it work on...