Measured actual electrical on my tank

[marie]

Info taken from sanjays site comparing a 250w SE xm bulb and a hqi ballast with a 400w SE bulb and an ordinary m59 ballast

ppfd of the 250w is 182 and the ppfd of the 400w is only 172. Your getting more light out of your 250w ballast then you would from a 400w ballast