LED lighting increases the ecological impact of light pollution irrespective of color temperature - Pawson - 2014 - Ecological Applications - Wiley Online Library
High- and Low-Pressure Sodium Lamp | SpringerLink
Evolution of the spectrum of a Low Pressure Sodium Lamp. | Download Scientific Diagram
The light spectrum of high-pressure sodium (HPS) and plasma lights. | Download Scientific Diagram
Emission spectrum of a high pressure sodium lamp. | Download Scientific Diagram
Atomic Spectra and Models of the Atom
Lighting-Gallery.net - Lamp spectra/Philips SON-T 150W
The Low Pressure Sodium Lamp
The Switch from Low-Pressure Sodium to Light Emitting Diodes Does Not Affect Bat Activity at Street Lights | PLOS ONE
Philips Spectral - Helium
The spectrum and color of sodium low pressure lamps - ACTION Project
Spectral calibration
Na spectrum | Emission spectrum for a sodium light. | Rather Anonymous | Flickr
Sodium-vapor lamp - Wikipedia
File:High Pressure Sodium Lamp Spectrum.jpg - Wikimedia Commons
What is the wavelength of the standard line from sodium vapour lamp? - Quora
Science, Technology and Engineering - Nightlase Technologies - Sydney, Australia
Spectral Lines Broadening | PhysicsOpenLab
