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Lighting forum, person (forgot) did measurements with different reflectors.
aluminum foil seemed to work best.
Most likely due to spirals aren't focused light to begin with and the more reflective facets the better to scatter the light and stop reflection back to the bulb.
Although I do think the bulbs maybe a little close to the top of the hood.
The reflectors at the end really help too since the stip lights don't go out to 30" only 24"
Yeah i am sure it would work better . Aluminum foil works for me - plants are growing , but anyone is welcome to use different type of reflector :)
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