by strengthen, if you mean to make them brighter theres a couple ways of how to do it: first one is to boil water in the microwave for ~ 5 minutes. after the water boils over then stick in the ultras. if you need a good excuse to get rid of a microwave, then pop those babies in for NO MORE than five seconds, your microwave has a chance it might explode, but if done perfectly, you can get it to glow at an INSANE level of light for ~ 2 minutes!

but i dont reccomend it. both of these methods would be really hard to do at a club.....