Ok Adding Anything In Veg Is A Waste Of Time And Theirs No Real Benefit To Adding Any 430-460 Blues To A M.H. Lamp. Now If You Want To Build A 240 Veg Light That Will Replace Your 400 Watt MH Hollar I Will Help
For Your Flowering Room. I Would Add At least 10 Watts Of 730's Per 600 Watts Of Hid. What 730's Do Is Basically It Puts Your Ladies To Sleep Faster. Which Is Why We Only Run Them At Or A Little Before Lights Out
You Mention Attaching Them To Your Hood. You Could Use 3/4 Square Tube For This And Run 3 730's On Both Sides For A Total Of 6 And Combined With The APV 16-700 Will give You 10 Watts Of 730s' For About 25.00 Usd