All I used was standard white LED's T10 Canbus compatible.
The blue is basically because of the brighter white light, the filter appears green with a standard yellow lamp because of the colour mixing.
The ones I purchased are These LED's The price has nearly doubled, I paid Β£3.95 for 10, they seem to be Β£6.95 now.
They are easy to fit, get the screen off and you can access the rear of the clocks. There are 4 large bulb holders spread across the rear of the clocks with T10 capless bulbs in. Swap these out for the LEDs and make sure they all work before rep