Originally Posted by the flying dutchman

Well, I have no experience with that but I can tell you how people do it
with indoor-hemp(Cannabis sativa) in the netherlands.(wich is illegal)

They use 300 watt grow-lights on a chain so you you can pull them higher
when needed.(when they are too high you have a loss of lumen)
They have a airation-system to control the temperatures(and for the smell)
wich blows fresh air in.
They paint the walls bright white.

I think 1000 watt gives alot of heat, so when it is not very cold in the garage
it may be too much heat in the enclosure and you have to get rid of the heat.

Then i think 60F is too low compared to the amount of Lumen.

Ron