Well unless you have some super super ultra high power 600 that I don't know about.. Your lux levels drop down to about 30,000 about 2 feet from the edge of the bulb. Enough to veg but pretty damn low for flower.
5' long though...where the hell do you think the light is coming from on a bulb? It's radiates from the sides, not the tip and base.
Light levels fall way way way off when you start to move away from the tip and base of the bulb. There is no hood on the market that will solve this problem (unless you go vertical)
Bottom line is this.. More watts = more yield. I have tried movers, different hoods, "supplemental lights" all a waste of time. Watts dude. Watts.