Not a fan of the OEM reflector at all.
The pattern really sucks!
Seems that an LED would be wasted in that application.
You'd get more light out there and do it cheaper than a light bar, but the LED's potential would suffer.
Same situation with retrofitted HID's on cars, more light but not as good as a housing designed for them.
A new housing that would fit as a direct OEM replacement, totally different story...