This is a great article! I did have one question though. The caveat it I know very little about lighting, and its measurements. Is this saying that in order to get the same ammount of light from LEDs as 40 watts of T12 I would need 91 watts worth of LEDs? I am having a hard time believing this, as my one watt LED headlamp is enough to blind you. I can't imagine 90 of these.
I guess I am asking more about what is a lumen. Isn't it a measurement of how much light we can see?