Auto Expressdid a test on various bulbs including the Philips.
The top rated one was the Osram Silverstar with the Halfords 30% & 50% brighter Xenon ones coming close behind.
I have the Halfords ones in the ST, one of each cause they don't do the 50% in one of the fitments - I forget which one.
They give a good beam allowing 100 + on my way home from work at night along a B road ( private test stretch of course
)
Well worth it and no gimmicky colours.
Andy