White light is a huge improvement on traditional illumination – but don’t just take our word for it. In 2005, an EVALUM* field test was carried out in Lyon, France, investigating respondents’ preferences for lighting types. Students living on the INSA campus and residents living in the city’s ‘Sixth district’ were asked to evaluate various light sources.
The results showed that people clearly preferred lamps with warm, white light of 3000 K color temperature. The satisfaction levels associated with these lamps were higher than those of yellow high-pressure sodium lamps and cold white light sources (4000-4200K spectrum).
* EVALUM: Evaluation de lumieres urbaines pour un eclairage durable (Evaluation of Light sources for Sustainable Lighting).