Utilization of Electrical Energy Illumination

If dΦ is the luminous flux incident normally on an area dA, then Illuminance is given as:

1

dΦ - dA

2

Φ × A

3

\(\frac{{dA}}{{d{\rm{\Phi }}}}\)

4

\(\frac{{d{\rm{\Phi }}}}{{dA}}\)

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