Just a quick one.

Does anyone have any information about calculating how much light to
"put into" a room? The room in question is 6.5m by 3.1m and will be
used for "conference"-type meetings; round-table discussions and
presentations to small groups of people in daylight and at night time.

The people in question will probably use standard 5ft or 6ft tubes at
least initially. They may, later, wish to change these to something
less industrial or possibly add up/wall lights, but let's ignore that
for now.

Intuitively I would have thought 4 or 6 tubes (1-tube fittings)
switched in banks of 2 or 3 would do the trick - high level of even
light for round-table meetings and the possibility of switching off a
bank or two for use with OHPs etc.

Does anyone have any better suggestions? What about the colour-balance
of the tubes?

TIA

Hwyl!

Martin.

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Martin Angove: http://www.tridwr.demon.co.uk/