Books, bricks, blocks, boxes, crates... Two milk crates or recycling bins, and a board, for instance.
-or-
Attach chains to ceiling, and make the lights adjustable.

Much easier to make the lights adjustable.

__________________
Your disappointments grow in direct proportion to your expectations.
If you are comfortable with your facts, you should assume I'll be comfortable challenging those facts.

Horticultural Myths and Folklore
Fox Farms Feeding Schedule
Dealing With Heat Issues in the Desert
Rusty's Bonsai Re-Vegging
CanCom Troubleshooting Forms