The ceiling height matters, but say 2.5m.

using 6 off 5' singles with 3500K triphosphor tubes on a 3x2 grid,
longwise dowmn the room, will give about 700 lux across the room at
table level, except for the 2' nearest the walls.

This is a bit bright for what you need, so go for what other posters
have said and use DL's for the table; and 4' tubes.

If the ceiling is much higher than 2.5m then you'll need to consider
louvred fittings to reduce the glare along the length of the room, and
recalculate!

Hwyl dda.