And its effect on learning environments
Children learn less well when light levels are low, and behaviour also suffers. There is an equity issue too, when light levels are uneven across a room. The Learnometer will measure light levels between 0 and 64,000lux in brightness.
Professor Heppell’s guide would be above 500 lux, with a target of 750 to 1,000 – but being careful to get suitable Kelvin values in your electrical lighting too. A minimum of 250 lux if there is only conversation taking place.