Ah right, so there's little or no space behind the casing for LED.
HID an option if there was somebody local to do it. Not something I'd probably try & do myself.
The spotlight option seems good, seen some posts where they've been bolted to the outside of the radiator. I'm assuming it's then easy to pick up a feed from the current headlight?
Had mine wired independently with their own on/off switch on the bars, and i'm really glad it was done that way now.
I use them as daylight running lights during summer, they are so bright they really get you noticed but they draw very little power in comparison to the headlights so it does your battery good as well.
In winter i put the spots on as well as the headlights, and together i can actually see the road ahead of me for a change, plus having the 4 lights on also gets you noticed even more.
The spots are aiming downwards about 25ft ahead of me so not upsetting any oncoming drivers at all.
These are the headlight bulbs i now use, they are a bit whiter than the Osram or Philips alternatives. I've tried them all and must say these look the best out of the 3, but still look poor compared to the spotlight outputs.
As i said, it's not the bulbs, it's the reflector unit that's rubbish.
https://www.autobulbsdirect.co.uk/search.php?mode=search&page=1&keep_https=yesCodes needed are H1ibL, and H4ibL
The above lights are on sale if anyone wants to try them in their cars as well, they're cheap enough.