Josep : I know what you are saying. All of the MPC's give Applications, numbers and candle power, but not wattage. Wattage of course is a good indication of heat generated, which of course can be important for distortion of plastic lenses.
Here is what I have done, which I believe is the easiest way : go to "Bulb Town" site; in the upper right is a search box; enter the bulb number you want to find out about, and wallah, there is all of the information you'll need.
Hope this helps (and it's easy).
Bob