What colour temp are your Osrams?
The White LEDs you buy will probably be closer to 6000k. My HIDS are 4300k and the LEDs are a cripser white/bluey. I wont be changing my HIDs to 6000k as it's a shocking loss in lumens. PIAA did do some 4500K LEDs that I wanted to get but nowhere has stock, it's end of line now.
But doesn't 6k give better night vision, I'm sure I read it did.. the way signs and road markings light up at 6k afaik is way better than at 4k3
It's a trade off, a little less light (not shocking loss), but better night performance, and isn't that what they are for

As a biker I prefer the look of 6k as I feel it gets bike noticed better than 'blending in' with every other light out there...so safer