That statement seems to defy logic... 400 watts is 400 watts isn't it? I mean if the power company charges by the kw/h how can one 400w item cost more to operate than another? It does not make any sense. I would agree 100% that the HPS or MH is more efficient than the floros for the wattage used compared to lumen output, but there is no way that 400w of floro costs more to run than 400w of HPS or MH.

L0rdsOth