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<title>GNU Scientific Library &ndash; Reference Manual: Light and Illumination</title>

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<p>
Next: <a href="Radioactivity.html#Radioactivity" accesskey="n" rel="next">Radioactivity</a>, Previous: <a href="Viscosity.html#Viscosity" accesskey="p" rel="previous">Viscosity</a>, Up: <a href="Physical-Constants.html#Physical-Constants" accesskey="u" rel="up">Physical Constants</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Light-and-Illumination-1"></a>
<h3 class="section">44.13 Light and Illumination</h3>
<a name="index-light_002c-units-of"></a>
<a name="index-illumination_002c-units-of"></a>

<dl compact="compact">
<dt><code>GSL_CONST_MKSA_STILB</code></dt>
<dd><p>The luminance of 1 stilb.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_LUMEN</code></dt>
<dd><p>The luminous flux of 1 lumen.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_LUX</code></dt>
<dd><p>The illuminance of 1 lux.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_PHOT</code></dt>
<dd><p>The illuminance of 1 phot.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_FOOTCANDLE</code></dt>
<dd><p>The illuminance of 1 footcandle.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_LAMBERT</code></dt>
<dd><p>The luminance of 1 lambert.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_FOOTLAMBERT</code></dt>
<dd><p>The luminance of 1 footlambert.
</p></dd>
</dl>





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