Terminology and measurements of operation lamp
• Lux
Unit for the amount of visible light measured by a luxmeter at a certain point.
• Central illuminance (Ec)
Illuminance (lx) at 1m distance from the light emitting surface in the light field centre.
• Light field centre
Point in the light field (lighted area) where illuminance reaches maximum lux intensity. It is the reference point for most measurements.
• Depth of illumination
The distance between the point of maximum intensity of illumination at the center of the illuminated field (1 meter from the surface emission of light) and the detection of the value of 20% of the maximum intensity of illminazione, measuring in the direction of the emission surface (L1 ) that in the opposite direction (L2). These values, added together (L1 + L2), gives the depth of illumination without the need to refocus.
• Shadow dilution
The lights ability to minimise the effect of obstructions.
• Light field diameter (D10)
Diameter of light field around the light field centre, ending where the illuminance reaches 10% of Ec. The average of four different cross sections through the light field centre.
• D50
Diameter of light field around the light field centre, ending where the illuminance reaches 50% of Ec. The average of four different cross sections through the light field centre
