1. CEN: EN 12464-1:2011 Light and lighting—lighting of work places part 1: indoor work places (2011)
2. ISO: ISO 8995-1:2002(en) Lighting of work places—part 1: indoor (2002)
3. Goodman, T.: Measurement and specification of lighting: a look at the future. Light. Res. Technol. 41, 229–243 (2009)
4. ISO: ISO/CIE 19476:2014 Characterization of the performance of illuminance meters and luminance meters (2014)
5. Statista (The Statistics Portal): Smartphones industry: statistics and Facts.
https://www.statista.com/topics/840/smartphones/