Haha. Gotcha. Well, if money’s not an issue and you can soup up your system, do it. But for many people buying new globes all the time and state of the art equipment is not an option. I can totally see where you’re coming from though. It is a never ending chase for improvement. I think if you’re getting over 1.2g/watt of light you’re doing well, but then if you factor in AC etc, that figure will go down. So really what you’re after is optimizing gram per watt of total electricity, not per watt of light. CO2 is a good idea then.