here it is

[BCReefer]

I knew I should have just said 5500 K bulb.

So if more wattage means more lumens which I presume can mean a deeper tank, then if one purchases a 400W ballast, be it a MH or a VHO, and the out put wattage is only 50 – 60 %, then you might not reach the bottom of the tank where the light is needed? So then you would be required to purchase 2 sets or do something totally different?

That is 1 heck of a long sentence.

I hope I am understanding this properly?? If not then I will save it for our next meeting and hopefully someone can explain it to me.