Speaking of white balance: I'm going to do a custom white balance after it gets fully dark: shoot a white card, do Menu > Custom WB and select the white card just photographed, exit the Menu, press
Before it gets fully dark I'm going to set the White Balance at "Daylight" which is 5200K and see how that works.
Metal Halide lamps seem to run in a range from 2300K for "white corrected" (Often used as accent lighting to blend in with fluorescent 2700K applications) to 4000K for "standard" (Used in general lighting; factories: parking lots, warehouses) to 5500K for "Hylux" (Daylight lamps: horticulture, aquariums, high color definition).
Ref: www.venturelighting.com/TechCenter/Lamps/color_of_light.htm
