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Since the manual does not specify and no one cares to share here it is.

The dome light uses a festoon bulb of 31mm.

My replacement was LED

 

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Correct. The original is 10W from what I remember, which is more than the map lights (8W each) but somehow it looked darker to me in real life. I think it's because map lights have a piece of shiny metal behind them so the light gets reflected back to the cabin. No such luck with the dome light or the cargo light -- most of the bulb output gets wasted there. These directional LEDs are really the way to go, they make such a difference!
 
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