That also has a lot to do with the whole emission spectrum, not just where it falls on the black body curve.<p>Low pressure sodium, for example, is a <i>very</i> narrow wavelength spike [1]. If you look at your hands under this, they appear as a kind of nasty gray with veins sticking out. Awful color rendering. [2]<p>On the flip side, it doesn&#x27;t scatter as strongly in the atmosphere, and the narrow wavelength band is much easier to filter out of measurements. So there&#x27;s a tradeoff. If you don&#x27;t care about dark skies, then phosphor-converted blue LEDs look like a pretty great idea. If you do, then make an informed decision based on the pros and cons of each side.<p>I&#x27;m in the lighting industry, and man has there been a lot of sillyness with LED uptake. Great for driving demand and pushing LED research and manufacturing forward, but you get tired of explaining that no, maybe fluorescent or metal halide would be a better tool for some jobs. We&#x27;re getting to a point where it&#x27;d be very infrequent for me to suggest them now, but the last couple of years...<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Sodium-vapor_lamp#&#x2F;media&#x2F;File:SOX.png" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Sodium-vapor_lamp#&#x2F;media&#x2F;File:...</a><p>[2] <a href="http:&#x2F;&#x2F;www.lighting-gallery.net&#x2F;gallery&#x2F;albums&#x2F;userpics&#x2F;11340&#x2F;normal_LPS-ColorRendering.png" rel="nofollow">http:&#x2F;&#x2F;www.lighting-gallery.net&#x2F;gallery&#x2F;albums&#x2F;userpics&#x2F;1134...</a>