The Hagner Special Luminance Meter, model L-202, is a small, portable and simple but functional instrument, specially designed for measurement and evaluation of the luminance at road tunnel entrances and their surroundings. The measuring range is 0 - 200,000 cd/m². The L-202 is used to determine what measuring range is required for a stationary Tunnel Photometer before it is ordered.
For luminance measurements, the optional PR-522 SpotMate replaces the standard illuminance accessory of the PR524. The PR-522 features true Pritchard Optics for unambiguous target alignment capability and can be provided with one of four measuring fields (apertures )- 2°, 1°, ½° or ¼°. For luminance measurements that are inaccessible to line-of-sight measurements, an optional fiber probe accessory can be utilized and for applications where it is necessary to make measurements of self emissive devices in an environment where the ambient light cannot be extinguished, a contact measurement Micro Reader Probe accessory can be employed. The PR-524 and the PR-522 can be ordered as a system, the PR-520.
For luminance measurements, the optional PR-523 SpotMate replaces the standard cosine diffuser of the PR525 Colormate. The PR-523 features a through-the-lens optical system (Pritchard Optics) for unambiguous target alignment. The PR-525 and the PR-523 can be ordered as a system, the PR-521.