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LNT Application Note - LIGHT INTENSIT Y DISTRIBUTION 3
There is a quite homogeneously illuminated area of roughly 2x2 mm2 beween these cartridge shades. This area is extended towards the
left-hand side (opposite to the illumination entrance) probably because of reections from the half cylinder and the inner surface of the high
pressure chamber.
While the photographs of Figure 2 show the qualitative illumination pattern very well, intensity measurements with a calibrated instrument are
necessary to determine the absolute illumination intensity. These were done using an OPHIR Nova II meter assembly with an PD300-TP sensor.
A foil with a 1 mm aperture was mounted in front of the sensor and the aperture was scanned in 0.5 mm steps in x/y-direction about 0.5 mm
beneath the upper half cylinder. The result is represented by a graph created with Micorsoft Excel in Figure 3. This graph is centered around the
maximum intensity measured and the shades give the relative intensity (in %) to this point. The size of the aperture causes the cartridge shades
to grow in width so that the maximum intensity here seems restricted to a 1x1 mm2 area.
The absolute intensity for sample illumination was determined using the setup described for Figure 3. As there are small variations depending
on the actual LED in a module the modules have the following intensity ranges:
Blue (λ = 460 nm): 5.5 - 8.0 mW/mm2
UV (λ = 385 nm): 5.0 - 7.5 mW/mm2
Green (λ = 520 nm): 1.5 - 2.5 mW/mm2
Red (λ = 660 nm): 2.3 - 3.3 mW/mm2
Amber (λ = 590 nm): 0.8 - 1.1 mW/mm2
Figure 3: Excel-Representation of the Intensity distribution (UV module) measured with a 1mm aperture in steps of 0,5
mm in x and y in the central part of the sample position; The axis are centered around the point with maximum intensity.