index of sensation, M

[5.9.11.5.5]

(of a source)

A number that expresses the effects of source luminance (L_s), solid angle factor (Q), position index (P), and the field luminance (F) on discomfort glare rating, where L_s and F are expressed in cd/m².

M = (0.5 L_s Q)/(PF^0.44)

See solid angle factor, Q for an equation defining Q.

 

NOTE: This definition was changed in RP-16-17 Addendum 4. 

 

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