Cada bujía-pie es eqyuivalente a 10,764 luxio. O sea, un valor promedio para las tareas que requieran la vista para su realización es 2 bujías-pie.

Por ejemplo, para los conductores:

Today, we finally realize that high uniformity is a key ingredient to better visibility. We know that if we can increase uniformity, and reduce direct, disabling glare for drivers, we will have a safer roadway and far better lighting job. With greater uniformity, the eye does not have to strain to adjust to the extreme ratios of alternating high maximum:low minimum light values. Today we are able to better optimize the "seeing task" . . . the driver's ability to see.

http://www.metrolux.com/medians.htm

Gratas horas.

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Note added at 10 mins (2004-02-14 17:46:02 GMT)
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<foot-candle> es correcto. Una bujía-pie representa la iluminación equivalente a la distribución de un lumen sobre un área de un pie cuadrado.

Diccionario Enciclopédico de Collazo.

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Note added at 11 mins (2004-02-14 17:46:58 GMT)
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Debí haber escrito:

Cada bujía-pie es equivalente a 10,764 luxios.

Mis disculpas a todos.