This is a great handicap of electronics, not being able to calculate the Real Maximum Wattage of a given component ! Whatever it is. I feel sorry for this side of electronics.
I planned this experiment for a long time and I did some of it before, but now I push it to a complete stage even if it is a negative result, doesnt matter, I tried. Hopefully someone else will get ideas and inspiration from my exercise and who knows maybe in the future there will be a way to read the real maximum wattage of -any- given component. That will be cool.
Until then... I am doing what everyone else suggested so far, guessing and using a good sense in pointing what it may be - if is completly unknown and if possible, comparing to something that exists. Also asking others, always is a good idea, haha.
Thanks a lot for the support and chat !