OK, I just connected my Happs blue translucent trackball to my pc power supply and my 12v bulb lit up perfectly. However...when I placed my bulb under the trackball it turned GREEN and not BLUE! May be a simple solution to this but is it because the bulb is white and not LED? Not sure why the color is Green but can I replace the bulb the trackball came with to something different, maybe LED or something else to make it a pure BLUE like Happs stated? What have you used for your BLUE trackball?