Just to add to Noel's post.
You can get higher power regular H7 bulbs.The osram nightbreaker+ does have a less yellow look than the normal bulbs and is much brighter.About £13 a pair on ebay.
They dont look blue/pure white of course but are better.Mine,in the hi beam have lasted near 2 years.
I wouldnt suggest getting those "xenon look/HID look" bulbs ,you can see a version of them in Halfords.
They are just normal bulbs with a full blue coating.
The light output is down on regular bulbs and they just look like,well blue coated bulbs.They wont match the drl's.
One thing you can do quite cheaply.to start is to replace the sidelight(w5w,t10) bulbs with a white led bulb.
Dont get ones with no cover on the led's/led as they will put a haze on the inside of the lamp reflector.
Ones like these are fine
http://www.ebay.ie/itm/190778812323...9.l2648#ht_500wt_1397&clk_rvr_id=458738001400
and will put a slightly bluer white tinge on your dipped beam as well,if you still have normal h7 bulbs(very slight).
You could get the full kit from a HID equipped megane,like Ahmed24 has done,if you check his posts).Self leveling and wash wipe bits required too as Noel says..for MOT anyway.
A medium to v good electrickery knowledge would be required .
I dont think I could do it myself,even if I could source the parts.
The last option ,as you talk about HID aftermarket kits.
1.Legality in the UK. Im not sure on as it doesnt really concern me.You definitely arent supposed to be able to pass the MOT with a kit fitted since new regs came in there.
You wouldnt be doing the MOT for awhile and its comparatively easy to change the kit back to "normal".Just saying.
I have enquired here,just after cmas at our local nct test centre.. and the situation here is as it was in the UK before the HID regs were brought in.
This doesnt mean that either here or the UK you cant be pulled up cos you have badly adjusted/glaring xenon/HID arclights.
If you are considering them.Get H7R bulbs.The H7R has a special shouding to mimic the beam pattern/use the reflector of regular H7 bulbs.
Its not 100% successfull but reasonablty so.
I had problems with my H7R bulbs being just 2 mm too long and fouling the metal bulb cap you can see over the dipped beam bulbs.
I had to put in spacers. Other posters here have fitted them without such problems.
To be absolutely sure of fitting you would have to get H7RC bulbs which are specially 2-3 mm shorter.
Sorry for all the types,but its best to be aware.
For bulb colour..get 4300k bulbs,thats pretty close to the white you see on all originally fitted HID and drl's..
Concerns for other road users..HID is much brighter,but if the aftermarket kit is set up properly it should be ok even tho other road users may think its too bright looking compared to theirs.
What you wont have..self leveling headlights:
Even HID cars with those fitted as standard have glared me on inclines/going over speed bumps as the leveling seems a little slow to react.
Not a big concern.
Mist/rainwater with no wash wipe system.
The headlamps on our cars are clear plastic with a surface that curves right back.
I find normal driving is fine,but if going slowly in towns/slow traffic blobs of water can build up and because of the nature of the lights and light dispersal this can raise the dipped beam light pattern enough to inconvenience others.
I lower the lights if im going slowly in bad conditions for any length of time(with the headlamp height adjust).
Insurance considerations..changing to say an osram nightbreaker or the phillips equivalent would be just like changing your normal bulb,as long as you didnt change the wattage from 55w.
The position on HID aftermarket lights in the UK..Ive no idea on.Even if a complete original renault system was fitted..,common sense to the motorist should mean hey Im good.
Whether the ins co would see it that way if there was a claim and they werent notified of the "modification" take your own guess.
There is also the colour issue of the H11 driving/fog lamps.
Those you will also have on a lot of the time.They are angled down anyway and my HID bulbs dont "lift" the beam.
The MOTaspect in relation to driving/foglamp HID's seem less clear than the dipped beam.
The lamp glass is near vertical so doesnt seem to disperse the light with rain/dirt
Hi beam..no point in changing..who is going to see it.. and because HID bulbs have a comparatively long warm up time,it would be more of an annoyance than anything else .By the time the lights warmed up enough to have better than normal bulb light output it could be time to dip them off again
nb .if you were thinking of getting something like osram H11's for the driving lamps ,they are much more expensive than H7 headlamp versions.
edit:Most of my "light changes" are in this thread :
http://www.renaultforums.co.uk/showthread.php?t=115651
Ahmed24 hasnt made that many posts so searching his posts should get his HID oem conversion easily.