low-pressure sodium lamp spectrum 700-350nm wavelength
<a href="//commons.wikimedia.org/w/index.php?title=User:StarlightCBL&amp;action=edit&amp;redlink=1" class="new" title="User:StarlightCBL (page does not exist)">StarlightCBL</a>
2008-04-13
<span class="int-own-work" lang="en">Own work</span>