What are differences between non luminous, luminous flames ?

Non-luminous flames are flames that do not produce light and are typically blue in color. They are typically produced by burning gases such as natural gas or propane in a controlled environment with sufficient oxygen. Non-luminous flames are often used in cooking appliances and heating systems.

Luminous flames, on the other hand, are flames that produce light and are typically yellow or orange in color. They are typically produced by burning solid or liquid fuels such as wood, paper, or oil in an environment with limited oxygen. Luminous flames are often seen in candles, bonfires, and oil lamps.

The main difference between non-luminous and luminous flames is the presence of light. Non-luminous flames do not produce light, while luminous flames do. Additionally, non-luminous flames are typically hotter and burn more cleanly than luminous flames.