I got a set of (new tech)20w cree 4 chip led's 6000k which is very bright and very good value at 60 pounds, outer ring seems abit dim tho but thats the design flaws.
The best of the best is gp thunders (old tech now)which many people rate them good but i think is 200 odd quid .
I had the v-shape one 6w 2-led 7000k ones before , the colour was very nice white with a tad of blue nothing chavy but they were not bright but the v-shape design got perfect balance light across both rings.
MY08 E92 335i M Sport|Wrap by Surrey Project |ETS Intercooler|VSRF Dp's|BMS OCC|BMC filter|CoBB AP|EBC Yellow & Coolcarbons rear|Alpina AT Map|Michelin PSS |CF grills,CF mirror,CF Performace spoiler|LCI light|CIC controller retrofit|2014 Mods: Birds B3 Suspension kit,Project Mu pads,Afe Filter and PTF Protune & Pilot sports cups. Gone:Forged FMIC, Eisenmann Race Quad, Eisenmann Sport Dual, Duke Dynamic Diffuser. Eibach Pro springs.