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![[Figure 5]](yn5073fig5mag.jpg)
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Figure 5
The notion of `brightness' or `brilliance'. (a) A fireplace does not have high brightness since its emission, coming from a large area and being spread over a broad angular range, cannot bring much radiation into the zone of utilization. (b) A flashlight is more effective, i.e. it has high brightness. (c) We define the brightness (Margaritondo, 1988  , 2002; Winick, 1995; Willmott, 2011; Mobilio et al., 2015; Bordovitsyn, 1999) by combining [equation (8)] the emitted flux F with the geometric parameters Ω (solid angle of emission) and Σ (source area). |
![[Figure 5]](yn5073fig5.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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