Electricity works according to pretty simple rules.

You need to first determine if your circuitry can handle the current demand of the lighting you are using.

Watts/Voltage = Current draw

So 100/12 = 8.33A per high beam. If both headlamps are on the same cicuit then double that, if high beams and headlights are on at the same time, quadruple it. Then add a little for wiggle room.

I just checked the wiring diagrams for my car, and they show a circuit for each high and low beam, at 8A each - which is not sufficient for the lamps you have. Don't substitute a higher rated fuse unless you also replace all the wiring attached to it.

Next comes heat. Most of the energy going into an incandescent lamp becomes heat, relatively little becomes light.

Basically I wouldn't do it.

Kevin

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'85 300SD