Looking through the journals, people like Mark, George, Dan and Graeme who use CO2 injection all have expensive luminaires with god knows how many watts per gallon. I was just wondering - is it...what's the word...a good idea to inject CO2 with low lighting (e.g. 1.5wpg)? Is there anything you need to take into consideration when doing so? The only person I can recall doing so is SuperColey.