Many street lights are orange because of the type of bulb used. The two main types of street lighting used in the United States are sodium-vapor bulbs and mercury-vapor bulbs. Both types work by applying electricity to a sealed container of gas in order to create light.
https://www.quora.com/Why-is-a-yellow-color-more-common-in-city-street-lighting-than-white
Street lights were yellow due to the use of Sodium vapor lamps which produce light in the narrow spectral range of 589.0 and 589.6 nm (yellow) and next level peaks in the orange region (590 to 620nm).
https://www.quora.com/Why-is-a-yellow-color-more-common-in-city-street-lighting-than-white
Temperature of Blue and Yellow Gas Flames. With enough oxygen, you get complete combustion and an LPG (Propane) flame burns at a temperature of around 1,980°C. For Natural Gas (Methane), the temperature is about 1,960°C. A yellow gas flame is indicative of incomplete combustion and carbon monoxide emissions. Yellow gas flames only burns at around 1,000 °C.
https://www.elgas.com.au/blog/1585-why-does-a-gas-flame-burn-blue-lpg-gas-natural-propane-methane
Earlier this year, an NBC 5 investigation into the safety of yellow corrugated stainless steel tubing, or CSST, showed how some fire investigators said energy from lightning has punched holes in the tubes, releasing gas and starting fires.
http://www.nbcdfw.com/investigations/Experts-Say-Flexible-Gas-Line-Lightning-Related-Fires-Continue-in-Spite-of-New-Safety-Measures-246966451.html
Lightning Safety. Recommendations. for Gas Piping Systems. Lightning is unpredictable; the chance of an individual building’s. being struck either directly or indirectly (nearby lightning strike) is based upon the geographical location and the topography of. the site.
http://0323c7c.netsolhost.com/docs/Lighting%20CSST.pdf
In nearby. lightning strikes, the energy of the lightning is transmitted to the. building through ground current transfer. Nearby lightning. strikes change ground potential and induce voltage waves. through magnetic flux and ground saturation. Nearby strikes may present hazards for mechanical systems due.
http://0323c7c.netsolhost.com/docs/Lighting%20CSST.pdf
To diminish the risk to gas piping systems presented by lightning. strikes, Omegaflex research and development efforts have lead to. CounterStrike™, a product which is an effective but affordable. tool in increasing the protection of CSST gas piping systems. from the damage caused by lightning strikes.
http://0323c7c.netsolhost.com/docs/Lighting%20CSST.pdf
Lightning Strike Fires Reignite Debate Over Gas Pipe Safety. This picture shows the natural gas manifold in the attic of the Rushing home in Lubbock, Texas. Five CSST lines deliver natural gas to different places in the home. There is also a lot of charred wood and insulation and what appear to be water spots on the camera lens. CSST is easy to recognize because it is yellow - which you see in the picture on the pipes. Courtesy of Lubbock Fire Dept.
http://www.nbcnews.com/news/investigations/lightning-strike-fires-reignite-debate-over-gas-pipe-safety-n55006
Receive the latest investigations updates in your inbox. New interviews and documents obtained by NBC 5 Investigates raise more questions about how well one manufacturer-recommended safety measure prevents lightning-related fires involving flexible gas lines and questions how often those fires happen.
http://www.nbcdfw.com/investigations/Experts-Say-Flexible-Gas-Line-Lightning-Related-Fires-Continue-in-Spite-of-New-Safety-Measures-246966451.html
The color of the light comes from the spectral output of the gas. In the case of a sodium-vapor bulb, the sodium gas tends to emit more photons in the long wavelength (Yellow, Orange, and Red) parts of the spectrum leading to the yellow/orange color you see.
https://www.quora.com/Why-is-a-yellow-color-more-common-in-city-street-lighting-than-white
what gas produces yellow lightning
Sodium gas produces yellow lightning. Sodium produces yellow lightning.