Watts this all about?

[anotheoldgit]

http://tinyurl.com/6feypw7

Once when the bulb blew in your light and one had no replacement on hand, one could pop down to their store and for a few pence one could select an identical replacement straight away.

But what happens now? One is confronted by a multitude of different shapes, sizes, styles and wattage, lumens, ???????

There are long ones, round ones, large screw, small screw, bayonet, it's a mine field.

Yes we have got Europe to thank for this (who else).

[Whickerman]

but the old type had dozens of variations too, that's my point - seriously, if you can't tell that a box with the label 'equivalent to 100watts' is more than you need...
You're overthinking it AOG.