What would be the best way to go about raising or lowering a table, keeping the light stationary. It will be quite heavy (soil beds) and would need to adjust up to 1.5' - 2'. Anyone have any ideas? The only thing I could come up with would be to put a hydraulic jack under the table and have jack stands on each corner of the table.

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.

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[QUOTE=Attach chains to ceiling, and make the lights adjustable.

Much easier to make the lights adjustable. [/QUOTE]

What Rusty said.... I have my lights hanging from some cord and a couple of pulleys.... easiest way to do it.

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Sorry I did not explain my situation better. This will be a perpetual system, with one tray going in 1 month after the other one. So the older tray with clones will be taller than the new one going in. I would like not having to tie all them down, as that would be a PITA. They will be under a 1000W HPS, SOG style in two 2'X3' trays. (The cement mixing trays from Lowes.)

transmission jacks have a good flat top and they have a high lift two to two and a have foot from the ground just a thought