Photometry

Illuminance (illuminancy)
$$E = \frac{\Phi}{S}$$
E - illuminance
Φ - light flux
S - area
Find   It is known that:
      =   
Calculate 'E'

Illuminance (illuminancy)
$$E = \frac{I}{R^{2}}$$
E - illuminance
I - light intensity
R - distance
Find   It is known that:
      =   
Calculate 'E'

Illuminance (illuminancy) with incidence angle
$$E = \frac{I\cdot cos(a)}{R^{2}}$$
E - illuminance
I - light intensity
R - distance
a - incidence angle
Find   It is known that:
      =   
Calculate 'E'

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