It takes 4x the amount of light to appear to be a doubling of light. Still, there should be some visible difference. Are they starved for voltage, as I'd suggested they may be in my
earlier reply?
Yes, and by extension, so do you. Google, and the forum search (also a Google) are your friend.
White light is white. Most of the time, light that "seems" whiter than other white light simply tend toward blue (often through envelope tinting). Seeing as your Osrams employ that, it may be tricking you into thinking it's "whiter".
You didn't buy the Wagner-branded ones, which are Philips' *seconds* and therefore might meet the HIR1 specification but still not be good enough for Philips to put their name on. For some reason, that Philips made them in the first place is good enough for some people, but you're going to get better ones when they are branded "Philips" instead of "Wagner". (At least I'm hoping Philips isn't selling any to Wagner that actually fail to meet the HIR1 specification.) You also didn't buy PIAA or IPF. You bought the right ones.