ok so u said u wanted the brightest that is like a 4.3k or 4.5k any lower and u drop out of the color spectrum into yellow( loss of light) any more and u get to high ( less light ) so u wana stay right around 4.1-4.7 k . thats the most absolut brigt light. also 55k as stated gives a washout look which will make them brighter but will wash the color out.
retrosolutions has 50 watt adjustable kits. and 6000k is the highest you should go if you want to see. me personally i always ran with phillips 95122 or osram 4300 since they get bluer after 100 hrs (colorshift)