Point detail

Operation of the lighting units mentioned in paragraph 4.3.1.1. above shall then be continued until photometric stability has occurred; this condition is considered to be fulfilled if the variation of the illuminance for the test points indicated in paragraph 4.3.1.1. above is less than 3 per cent within any 15 minutes period. After photometric stability has occurred, aiming for complete photometry shall be performed and the photometric values at all required test points shall be determined.