Reflectors

you could shape one out of sheet metal.. make sure it has a white finish to it or whatever. i don't know much about sheet metal.

You could also fashion some sort of top and then line the top with a piece of black/white poly, its very reflective stuff, prolly some of the best stuff. I used it when i was growing indoor plants with a HPS system.
 
i use mirrors

i just superglue them to the top under the lights

it works great for me
 

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