Consider importing EFO 'light regimen' or making a less specific class

[kristenpeach]

EFO light regimen: http://purl.obolibrary.org/obo/EO_0007196

Definition (A type of light used in a commercial light box to simulate natural daylight. For experiments carried out in growth chambers, the daylight is a light source providing a color temperature of 6500+/-200 K at an illumination of 90 to 120 ft/candles. This source is typically provided by fluorescent, tungsten or halogen lamps. The treatment involving day light as the light of the sun or the artificial light in a growth chamber.) is really specific. Based on what Dan learned about human dynamic light studies we may want to start thinking about adding more light quality classes