- http://meaningness.com/metablog/sad-light-lumens
- http://www.thelightbulb.co.uk/resources/lumens_watts
- http://www.osram.com/osram_com/products/lamps/specialty-lamps/metal-halide-lamps/hmi/index.jsp?productId=
- https://www.rotolight.com/product/anova-v2-bi-colour/
- http://www.procam.tv/rotolight-anova-v2