Macro Algae Light Requirements

[jslaney]

I was trying to find information about Macro algae light requirements and came across the following really good general artical on Macro Algae...

http://reefkeeping.com/issues/2007-01/sl/index.php

In it they quote that you need anywhere from 60 - 150 PPFD depending on the algae.

Anyone have any clue how to convert those units to number of PC bulbs per gallon?

Might be a lost cause but I thought I would give it a try.

Thanks,

Jon.