Is it really 150% or 50% brighter? (this is question to philips I think)

The measure of brightness is probably marketing BS. What you're looking for isn't really peak lumens but what's called a figure of merit measurement. This sticks the bulb in a typical reflector and measures how much light goes where you want it to go. You might have a really bright beam but if it's illuminating the wrong place then it's bloody useless. The interaction with the reflector depends on a few things (such as that lovely silvery bit on the end which will reflect and block light). I really dunno what they have based their measurement on but you can be damned sure it'll be in completely ideal conditions when magical fairies happen to be farting in the direction of the northern lights or something. From quantitative testing in experimental conditions I can say these are the best using FOM and using the reflector employed during testing. Osram's top of the range bulbs came a very close second and probably within the margin for error of the testing. Compared to the FOM measures of an OEM bulb (various makes, they're all various levels of shite) the result for this was some 3 or 4 times higher. Basically this is brighter overall (which means you MUST ensure your dipped beams are aimed right - easy to do with a wall or using the car in front in stopped traffic and the little adjuster in the cockpit) and put more light where it needs to be on the road. You will be able to see the outline of the projection of the reflector with these things (i.e. a spike on the left hand side to illuminate road signs and then dropping down where it hits oncoming traffic so as not to blind them) which you have no chance of seeing with stock bulbs unless you have HIDs. On the subject of HID - I fitted a HID kit (an expensive one, not crap) to my motorcycle and after technical issues I removed it and replaced it with one of these high end bulbs. The end result was 90% of the efficacy for about 20% of the cost. Hope this helps.

are these bulbs main/dip in one bulb

Yes the bulbs are main and dip in one bulb. They are a whiter light than original. Certainly brighter.

Are these bulbs UK road legal

No, these are not legal, if you want a light upgrade, go to a main dealer and ask about a xenon light upgrade. Car lights are special designed for a certain bulb, upgrading a bulb is dangerous as it can cause unnecessary glare to on coming vehicles. Which is why Mot centres do not pass these upgrades.

How long should they last? I fit them in april and one bulb has already blown

Bulb life will be compromised if it is soiled when fitted. Make sure the next bulb is spotless and dont touch it with you fingers

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🚗 Brighten your journey, own the night!

PRECISION ENGINEERED - ECE homologation ensures top-tier quality and safety standards.
ILLUMINATE YOUR DRIVE - Up to 150% brighter light for unmatched visibility and faster reaction times.
TWIN PACK CONVENIENCE - Two bulbs included for front lighting upgrade or seamless replacement.
LONG LASTING PERFORMANCE - Durable 200-hour lifespan keeps your headlights shining strong.
SHARPER CONTRAST SAFER ROADS - Enhanced light contrast improves road detail recognition for confident driving.

Philips RacingVision +150% H4 Headlight Bulbs deliver significantly enhanced brightness and improved light contrast, boosting driver visibility and safety. Engineered in Germany with ECE homologation, these 12V bulbs offer a reliable 200-hour lifespan and come in a convenient twin pack for front vehicle lighting upgrades.

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Manufacturer	Lumileds Germany GmbH
Brand	Philips
Model	12342RVS2
Product Dimensions	8.1 x 4.5 x 4.5 cm; 22 g
Item model number	12342RVS2
Manufacturer part number	12342RVS2
OEM Part Number	0005449094, 00412, 01172300, 02154270, 025816
Position	Front
Special Features	Life time 200H
Mirror lighting type	H4
Voltage	12 Volts
Item Weight	22 g

Philips RacingVision +150% H4 Headlight Bulb 12342RVS2, Twin Pack [Energy Class A]

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