Here is a little lesson in wavelengths. Technically, you dont want the brightest but you want the most highest luman rating.
Our eyes see 4300K the best (I believe, it's been a while but I am pretty sure it is 4300). K is temp in Kelvin. As you go up it goes through the rainbow blue/purp, as you go down it goes yellow/red.
I like 5000K because it is white, but is slightly less visible light than 4300K.
The issue of the bulbs not igniting is more of a temp thing. Cold temps makes them not want to light. Also, getting oil (from fingers) or water on them can be bad. Oil will boil and can break the bulbs, and water can take temp away (like a heat synk) and not let it ignite.
All it is is basically a neon tube like in a bar, but puts out a lot more light.
Anyways, all that being said, most kits work great now a days. This is why you are seeing them in OEM cars. Although OEM uses digital ballasts and most others (DDM, etc.) use analog. Digital is more expensive but more reliable, but I have not had ANY issues with my DDM's over the past few years.