here is the thing; I do a lot of work late at night in my computer, i love to design in the dark, but using photoshop shortcuts gets complicated, so i decided to do something about it , at first went for a lit up keyboard ... naah too expensive, (being a diy´er, everything is doable... therefore expensive) found this Instructable and eureka ...lol http://www.instructables.com/id/Illuminated-Keyboard-Hack/?ALLSTEPS first i thought the power of the LEDs (green lites with 3.v.) was not enough to power my high brightness or superduper leds as the proper commercial name goes. (4.5v?) so i took power from usb port easier for me . parts ... clear acrillyc rod, round is better but since my led bar will be underneath my desk i chose a square rod six or seven or nine leds , it all depends my bar is 20" (51 cm) long so i used 6 leds 4" (10 cm) appart from each other ..sort of enough cable to connect the leds , you will need at least 25 " ( why the hell are you still using inches ??? 65 cm) use the red and black cable , it is imperative that you have to use red and black or else forces unknown of the universe will mess up your life, or go with any color you like. 1 kill switch ... any kind, mine is really small 5mmx10mm (imperial equivalence.. guess it) you will need a clear ...CLEAR epoxi glue , see the pictures, silicone will work too, but is waaay slower. double sided tape , to fix in place. one slice of key lime pie ( you will get hungry.. i was!) tools: cutter, exacto, carpet knife... get the point? cable stripper (lol one girl dancing for the cable ...) electric tape or thermofit or duct tape or masking tape. pliers to cut led legs a 7mm drill bit (1/4 ") electric drill or manual or robotic... press drill is better. sandpaper the coarser the better soldering gun and accessories a spoon.
http://www.instructables.com/id/usb-powered-keyboard-led-lamp-home-made-boom-chika/