Conversions can be done either with the "->" conversion operator or with the equivalent "convert" function. The function has three parameters: a quantity, a unit to convert from and a unit to convert to. Likewise the conversion operator uses three values: the quantity and unit to convert from are placed on the left side of the operator while the unit to convert to goes to the right side.
The basic unit of illuminance is the lux. All units of illuminance are expressed in terms of this base unit and so measurements can be converted from any one of the following units to any other.
10 lux -> footCandle = 0.9290304
convert(10; lux; footCandle) = 0.9290304
10 lux -> nox = 10,000
convert(10; lux; nox) = 10,000
10 lux -> phot = 0.0001
convert(10; lux; phot) = 0.0001
10 footCandles -> lux= 107.6391
convert(10; footCandle; Lux) = 107.6391
10 nox -> lux = 0.01
convert(10; nox; lux) = 0.01
10 phot -> lux = 1,000,000
convert(10; phot; lux) = 1,000,000
10 footCandle -> nox = 107,639.1
convert(10; footCandle; nox) = 107,639.1
10 footCandle -> phot = 0.0010764
convert(10; footCandle; phot) = 0.0010764
10 nox -> phot = 0.0000001
convert(10; nox; phot) = 0.0000001
10 phot -> nox = 1e+9
convert(10; phot; nox) = 1e+9