Question for the light Pros

I have a light question for the pros. I have read all of the post from you guys and I am just a novice.. I want to use a combo of light. Currently I am using a Blue Max Full Spectrum 6 bulb T5. A very nice light, but I would like to add a 400w HPS grow light for flowering.

Below are the specs for my FloroUltraLux SPECIFICATIONS
6-Lamp
High Bay
280w
Watts - Electrical Usage
5900K Kelvin Temp.
93+ C.R.I.
35,000 Average Lamp Hours
2 Fixture S/P Factor
28,500 Fixture Lumen - Photopic
57,000 Fixture Lumens - Scotopic
200 Visual Acuity Lumens Per Watt

light that I am using for veg and flowering.

Question: Will it be useful for me to add the 400w HPS light in conjunction with the following Full Spectrum light mix? How many plants do you think I can get under both lights when used at the same time?

Thanx..
budding grower

Wow.. Got 30 views but nobody has a clue??

Any advice is cool..

thanx