*Attention:* The IES website will be temporarily unavailable from May 9th to May 13th for site updates. We apologize for any inconvenience and will provide an update closer to the time. Thank you for your continued support of the Illuminating Engineering Society.
DonateJoinMy IES

conical-directional reflectance

[7.3.3.6] ρ(ωi;θr,φr)
The ratio of reflected flux collected over an element of solid angle surrounding the given direction to the incident flux limited to a conical solid angle.

Figure 10
Figure 10

Note: The direction and the extent of the cone must be specified, and the direction of collection and size of the solid angle “element” must be specified.

« Back to Definitions Index