I am trying to perform a UGR-evaluation of a room, but am not sure how to do this correctly according to DIN 12464-1, nor how to accurately interpret the results.
Sadly, I do not have access to the CIE 117 to read up directly about the "tabular method".
- rectangular, BxL = 5.8 x 6.8 m, height 2.64 m
- 4 identical luminaires, positioned flush with the ceiling
- one large table in the middle (2.1x4.1m. height 0.74 m), chairs sorted around the table
The evaluation planes:
- task area, assigned to the table, so at height 0.75 m and set to profile DIN 12464-1 - office - conference room
- evaluation area (reference plane) at 0.75 m height
- three UGR-observers, placed in the room according to three chairs, at height 1.2 m (eye height), +/- 90° horizontal viewing angle and viewing direction towards the table
- taks area: no UGR value
- evaluation area: one max UGR-value (ex. UGR (4.0H 4.7H) <= 20.9)
- UGR-observers: graphs of UGR-value according to viewing angle for each of the observers
- 4.0H 4.7H correspondends to a H = 2.64-1.2=1.44, with B = 4.0H
and L = 4.7H -> this means that the UGR-evaluation was at height 1.2
m, even though the evaluation area is at 0.75 m??
- is the result of the "table method" according to CIE 117 this one UGR limit value for the evaluation plane?
- the results from the UGR-observers are interesting, but as far as I understand it, irrelevant for the DIN 12464-1 evaluation?
- why is there no UGR-results from the task area?
Thanks a lot for clarifications!
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