You turned yellow

[PiperCub]

^^ You've always been hip mate!!!!!  

[panhard65]

My 204 has yellow front fog lights and yellow covers on the headlight bulbs. They do reduce glare on foggy nights but thats about it. Most of the GT cars at Le Mans still use yellow lights with no problems. I think it is done so the drivers can tell when a much faster car is coming up behind them (LMP's use white light). They are legal in the UK and should pass the mot. I had a bloke with a Renault 12 ask me about them last weekend at La Vie as he wanted to fit them but was unsure if they would pass the mot.

[LessThanEqual]

I'm pretty sure the yellow lamps do not increase visibility but reduce glare for other road users, hence why moderns with their cool white light, or emergency-services blue in the case of BMW stuff at a distance, is so bloody dazzling at night compared to standard bulbs.

[PiperCub]

I think they will pass an MoT OK. It's one of those things that are probably allowed but not recommended I suspect. It's more concerned with the headlights being a matched pair for type, shape, intensity, beam pattern, colour etc. 

It mentions yellow headlamps (in the bit about anything other than red light out of a red lamp, white out of white and yellow out of a yellow lamp).

[Squire_Dawson]

Sorry to spoil this little party, #ChiefWiggum, but any car so fitted should not pass the MoT test. Mine didn't; reason - for not showing a white light up front. I haven't used them since. As Junkmaster said, they are also of no benefit at all, whatever pseudo-science they were founded on has since been refuted as utter tripe as long ago as the 1950's, there being no improvement over plain white bulbs in either clear or foggy conditions. It is more pertinent to discuss the growing menace of the fashion-conscious baboons stimulating 'progress' by creating a night time scene which would rival the anti-aircraft defences over London during the Blitz. And no prizes for the foremost offenders being Boche crap-peddlars. You can take your high-intensity, high-definition, LED and laser-lights and stick them up your arse along with an atomic fireball. Nobody, repeat nobody (official rally drivers excepted), requires anything more than a pair of 60/75w dipped/main beam halogen up front and 5/21w tail/stop lamps at rear.

[SiC]

You can take your high-intensity, high-definition, LED and laser-lights and stick them up your arse along with an atomic fireball. Nobody, repeat nobody (official rally drivers excepted), requires anything more than a pair of 60/75w dipped/main beam halogen up front and 5/21w tail/stop lamps at rear.

Manufacturer fitted HID bulbs are only 35w and the LED headlights are even lower.

 

Of course those bulbs put out more lumens per watt (i.e. more efficient) so hence brighter...

[Conrad D. Conelrad]

Sorry to spoil this little party, #ChiefWiggum, but any car so fitted should not pass the MoT test. Mine didn't; reason - for not showing a white light up front.

 

As far as I can tell, they should not fail. My yellow headlamps failed with this reason:

 

Headlamp incorrect colour (1.7.5b)

 

However, 1.7.5b reads:

 

 

 

If someone can find something in the MOT manual which legitimises a fail, post it here because I can't find it. 

[Squire_Dawson]

Which begs the questions, why aren't vehicles with blue lights up front (at least that is how they appear on the road) failing the test, and what are the requirements for flashing indicators, with regard to Audi paging indicators (I thought the indicator had to show a steady light). These modern headlamps appear to be signalling you by flashing from behind, observed through the rear-view mirror, when really it is just slight undulations on the road causing this effect. That, to me, is bad design.

[Junkman]