Philips X-treme Power H4 12V 55W/60W + 80% more light

Introducing the new world champion in high performance headlamp upgrades. Philips H4 X-treme Power bulbs deliver up to an astounding 80% more light than standard H4 halogens, yet they're fully road legal and come with the same quality and performance put into the lighting Philips sell to OEMs around the world. X-treme Power is a new "must-have" for tuners and high performance drivers.

Here's what Auto Express have said:

"Philips' latest bulb was so new, we could not randomly select test samples, so couldn't include it in our assessment. Yet the performance of the pre-production unit was staggering. Even compared with the current benchmark plus 50 per cent bulbs, the difference was immediate and dramatic. Philips claims an 80 per cent improvement over standard units, but we think that is conservative."

"The results have been achieved in the same way as the 30 and 50 per cent lamps - by taking the allowed tolerances right to the edge. This time, though, as well as reducing the filament and burning it hotter, Philips has shrunk the glass casing."

"As a result, the gas pressure can be increased for better light output. Engineers have also optimised the geometry and shield position to focus the light where it is needed."

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