TS wrote in message ...
My basement indoor space is 5X4, and I recently added a shelf (3 tiers)
with 2 double florescents above each shelf. I want to add a 400 watt MH,
hung from the ceiling to add more light (and grow some other taller
plants- like Hibiscus). I figure that the lower light orchids can be on
the lower shelves, with the high-light lovers on the upper shelves
closer to the MH.


A 400 watt bulb gets mighty hot; I hope you are able to mount it so it
won't be a fire hazard and the heat won't damage the plants.

J. Del Col