Flavia Perugini  is correct but one important item is missing. The
Lumens/ Lux levels are for a certain distance from the fixture to the
floor or item. A 500 lumen at 10 feet is quite different at 20 feet.
Make sure that you get the height correct or you may fry something.
Willia M. Greaves
Architects in Design
www.architectsindesign.com





A clear definition of lumens can be found in this publication: 'The
Museum
Environment' by Garry Thomson (Ed. Butterworth-Heinemann).  You may want
to
check page 20.
To reassume:
(Imperial system)       1 footcandle = 1 lumen/square foot
(Metric system) 1 lux    = 1 lumen/square metre
                        1 footcandle = 10 lux                   = 10
lumens

                        1 lux    = 1/10 footcandle      = 1/10
lumens/square
foot
Confusing as it may look, it is pretty easy.
Good luck.

Flavia Perugini, conservator
George Washington's Mount Vernon
P.O. Box 110
Mount Vernon, VA 22121-0110
Tel. (703) 799-8632
Fax (703) 799 8698
[log in to unmask]
www.mountvernon.org

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