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Shielding angle

The shielding angle indicates the degree of shielding of a luminaire. A distinction is made between the upper shielding angle defined in DIN EN 12464-1 and the lower shielding angle defined in DIN EN 12665. The lower shielding angle of a luminaire is the angle between a vertical line through the illuminant and the point from which a direct view of the illuminant is not yet possible. The upper shielding angle, on the other hand, is the angle between the lowest horizontal line of a luminaire and the point below which the illuminant in the luminaire is just visible. If the shielding angle is not correct, unwanted direct glare and reduced visual performance may result. Depending on the luminance of the lamps, various minimum values must be observed. Back
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