Question 1

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

Accepted Answer

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.

Question 2

are these bulbs main/dip in one bulb

Accepted Answer

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

Question 3

Are these bulbs UK road legal

Accepted Answer

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.

Question 4

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

Accepted Answer

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

ASIN	B01LZEXHKL
Auto Part Position	Front
Automotive Fit Type	Universal Fit
Best Sellers Rank	320,514 in Automotive ( See Top 100 in Automotive ) 606 in Automotive Turn Signal Bulbs
Brand Name	PHILIPS
Color Temperature	6000 Kelvin
Colour	Blue
Customer Reviews	4.5 4.5 out of 5 stars (10,551)
Fit Type	Universal Fit
Global Trade Identification Number	08719018000224, 08719018000231
Included Components	glass, metal
Item Type Name	H4 Headlight Bulb
Item Weight	1 Grams
Light Source Type	Halogen
Manufacturer	Philips
Manufacturer Part Number	12342RVB1
Manufacturer Warranty Description	24 months
Model Number	0730250
Package Quantity	1
Specific Uses For Product	Head Light
Unit Count	1.0 count
Voltage	12 Volts

Philips RacingVision +150% H4 headlight bulb 12342RVB1, single blister

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