JamesC said:This just isn't the case and I'd be interested in seeing where you got that figure from. T5's are better but not that much better. The longer the tube becomes the less of an improvement there is over T8's.Matt Holbrook-Bull said:remember T5 output about 3 times the amount of light that a T8 does.
Tom Barr said this about 2 years ago.. maybe hes changed his mind.. again.. like he does. Im not a scientist so I have no idea exactly what he said.
Anyway, whether thats the case or not.. thats still alot of light you have there which will be driving any problems very hard. Its far better when your experiencing issues to 'throttle down' the system by reducing amount of light. Light is the overall factor that will determine how fast the system operates.