First all states say that the headlights must have White output and only emergency vehicles are allowed any blue lights on them. Plus the bulbs that you are looking at are slated as "Off-Road/ Show use only". In the state I live in it is a $500 fine each bulb. In the 2 surrounding states the fine is well over that.
Now to the issue of light output: the human eye cannot see into the UV spectrum, which the so called blue bulbs are hitting the edge of. You will not have the same output of light from them a all.
Now if you want better light output there are 2 ways to go. First is a true HiD kit. I believe that JJ at Retro Shop can help there. Next is to get some of the new LeD headlight bulbs. For the moment these are what I am running:
GP-Xtreme GP-H13-CR-HL HyperWhite Cree 1512 Chips - Hid Lights USA
The pattern is a bit different than stock, but they are extremely bright and output pure white light, with no blue at all in them.
Another problem with the blue headlight bulbs is they cause massive glare for oncoming drivers, which can cause an accident.
Sorry guy but I do not recommend those blue bulbs at all.