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If you add one extra bulb and the voltage remains constant, then you have doubled the current drained from the regulator.

12 Volt and One 12 Watt lightbulb drains 1 Ampere Current.

12 Volt and Two 12 Watt light bulbs drains 2 Ampere Current.

However:

If having a 24 volt powersource and you add two 12 Volt 12 Watt in serial, then you still only drain 1 Ampere Current.

NOTE:

Wattage and Voltage of bulbs may be different even if the sockets are the same.

Lower voltage on the bulb will increase the current drain, if voltage is a lot lower it might cause the circuit delivering voltage to burn out or blow a fuse. It can also quickly burn the bulb, sometimes in a fraction of a second.

It will however do little damage to add a bulb with higher voltage than the circuit is designed for. You will then only observe that you do not get the light you might hope for.

Total Current/Ampere= Combined Wattage divided by Voltage

Total Wattage = Combined Current or Ampere multiplied by Voltage.

Regards.

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