Phillips H7 Diamond White

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docttor999

Member
Hi guys

Have been reading up on the headlight bulb changes from halogen.

Just saw these http://www.autobulbsdirect.co.uk/H7-Philips-Diamond-Vision-Headlight-Bulbs.html

Anyone used them on the zed? Note they are blue so not sure how they would look on the headlights when the lights are not on. I know most people have the standard H7's but I was looking for a more whiter look. However dont want the blue to ruin the headlights though with the bulb colour.

Thanks for the opinions,
 
If you're after more light, then that website shows plenty of +xx% bulbs.

IIRC, in my e34 M5 (before the HID conversion), I had the Philips X-Treme Power ones, but the Osram Night Breaker and Ring Xenon Max will be fine without using a blue bulb (which is usually just to change the colour, rather than produce more light, and cost almost twice as much).
 
mmm-five said:
If you're after more light, then that website shows plenty of +xx% bulbs.

IIRC, in my e34 M5 (before the HID conversion), I had the Philips X-Treme Power ones, but the Osram Night Breaker and Ring Xenon Max will be fine without using a blue bulb (which is usually just to change the colour, rather than produce more light, and cost almost twice as much).
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I thought the blue to the bulb also increases the more whiter light as well?
 
Generally, bluer coloured bulbs produce less light. Not sure exactly what causes it, but certainly when I've investigated different-coloured xenon bulbs those with a higher "k" (kelvin?) value produce less light. The higher a k value, the bluer/purpley a bulb appears. The lower the figure, the whiter the light.

OEM xenons on most cars are 4300k. I'm not sure what colour OEM halogen bulbs are, but I'm sure the Philips Xtreme ones are 5000k making them not quite as white as xenons but not far off.

I previously used the Philips Xtreme +80% bulbs and found them great in other cars. They're a definate improvement in the Z4, but the headlights are still poor with them IMO, hence I went retrofit HID bulbs.
 
Have done some reading on the forums and people seem very happy with the diamond white. Can I check do I need to buy 2 sets of H7's for the dipped and main beams? Also what bulbs do I need for the sidelights?

Thanks
 
Honestly I can't remember which bulbs for the sidelights, but I can confirm you'll need two sets of H7s - one for the dipped and one for full beam.
 
Do you think the sidelights need changing if I change the dipped and main beams? The only reason why I think they will do is because they come on with the dipped beams ans may look out of sort with the upgraded whiter bulbs?
 
I use Philips Xtreme H7 - make a big difference!!!
I think the Bosch equivalent is even better though - I read a report recently but can't find it
 
m44rrt said:
I use Philips Xtreme H7 - make a big difference!!!
I think the Bosch equivalent is even better though - I read a report recently but can't find it
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Did u change both dipped/main beam and side lights?
 
docttor999 said:
I thought the blue to the bulb also increases the more whiter light as well?
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It's the same whitening effect that washing powder gives by adding 'blue crystals' to their formulations.

The blue makes it look whiter, but it moves the whole range of light output up the spectrum slightly, so you end up putting more of the energy into the invisible (ultraviolet) part of the spectrum.
It's just that as you move up the spectrum you lose some of the red end of the light, which makes the output bluer. If you move down the spectrum to lose some of the violet end, then the light looks more yellow.

Between 3500 and 4500 kelvin is equivalent to 'daylight', but I've seen HID bulbs offering everything from 2000k which are great if you want yellow foglights, to 17000k which look deep purple which are useless for anything other than show, but I've seen them on motorbikes.

light_spectrum.png
 
m44rrt said:
But I did buy new backs for my lights as I had condensation issues
These have gone now (fingers crossed)
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U reckon it was the bulb change that caused the condensation?

Others had this issue?
 
docttor999 said:
m44rrt said:
But I did buy new backs for my lights as I had condensation issues
These have gone now (fingers crossed)
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U reckon it was the bulb change that caused the condensation?

Others had this issue?
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it is easy to pinch the rubber seal when refitting the backs to the headlights. Condensation then only a matter of time.

New back with seal costs about £8 though...
 
No - that was before the change
But while cover was off it seemed the right thing to do
About £9 per side and it is the rubber you are really buying
 
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