What year Vision are we talking about? Sealed beam or just the bulb? I think any upgrade from halogen would be great, I'd just be worried about it passing an inspection.
I'd love to try the new Trucklite Roadmax LED headlight replacement units that Thomas has on the Jouley Electric bus, but the cost and the possibility of an inspection fail are holding me back
How well do they fit in the IC headlight cap? With the ones i use its a struggle to get everything to fit inside the cap. I see the bulbs you use do not have the fan so there may be more room.