I have the francis bright bulbs as running lights in my 35 std coupe, installed them back in 2000.
For the brake light bulbs I used GE HP1, 100 watt halogen bulbs and used a 40 amp circuit breaker from francis to protect the system. I also have a pair of Harley lights mounted off my luggage rack with same bulbs as like 3rd brake lights. You know when I have my foot on the brake when your behind me.
When you put your foot on the brakes at idle and 14 volts, it goes down to 9 volts charging they draw that much power.
The GE HP1 bulbs are actually driving lite bulbs sold at Canadian tire.
mike lynch