What are the two blue lights in the top of the instrument panal above the speedo

What is your question?

There are 2 light bulbs in the instrument panal above the speed o meter that don't light up. Looking up from the speedo i can see blue that is in the panal where the bulbs are. When I take the bulbs out and shine a small light in the hole where the bulbs go I can see the blue light up. Nothing I do make those bulbs light, what are they for.