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case mod on a 360. need help with led lighting?

i used the 12 v power next to power inlet. ok i wired total of 8 leds in parallel. 6 of them are 1.9 volts and the other two are white leds of 3.3volts. now my white ones dont have power they dnt turn on . i wanted to make an effect of a really bright inside but i think i dont have enough power. i want to stick to this one 12 volt power source. whats the best way to go about putting the leds.