Switch globes

[RR P38]

I have replaced a few blown bulbs today.
Cruise control switch bulb and the EAS override bulb.
Question, why is there a green and an orange bulb in each one?
My cruise is on the blink ATM, when the cruise is active does the light change from orange too green?

[Scouse]

The green is for backlighting (when the dash lights are on), the orange globe is the 'switch on' indicator.

Some switches have 2 green globes (the genuine driving light switch does anyway).