Driving lights are great for lighting up the road in front
of you, but it's a landing light.

What ever light source used, shouldn't the light be focused
about a mile from here?

I suspect a deeper reflector may be involved, and that may
require a larger diameter reflector. Just a guess tho.

We are trying to light up the runway - mile? half-mile??
1/4 mile???
in front of the plane?

Advice?

Before installing a lot of hardware on your plane...
Test It

Take whatever lights you want to use for landing lights -
outside some dark scary night, and turn them on.

Look down the block and see how far you can see.
(you see?)

Suggestion?

Get one of those 1,000,000 CP 12v cigarette lighter plug-in
"emergency/boat" light at WallyWorld?

Turn that puppy on...

THEN choose.