Sorry for butting in, but DE bulbs will either run on electronic ballasts or HQI ballast not standard magnetic ballasts.....
As far as my reference to my theory or idea on what I had posted earlier......If you go to cnidarianreef dot com/lamps.cfm and read through the site, you'll see that time and effort was put into it to simplify things a bit, and the readings are there.....What your looking at is the PAR readings.......Again alot does depending on the ballast bulb combination, but you will see somewhat that you do find higher PAR readings with the PFO ballasts.....You can get high readings running SE bulbs on HQI ballasts, but your overdriving the bulb and that IMO would result in shorter bulb life......
Again take time to read through the info........And the best reflector on the market as of know is still he Lumenarc, so again with the right bulb ballast combination you can have magic!!!!!!!!!!