# Does light have any temperature?

Is there anything like cold or warm light? Everything in this world has a temperature, What about light?

• Try thinking of temperature as a measure of the random kinetic energy of particles. What happens then? – user191954 Oct 3 '18 at 14:56
• Light has speed. If we talk about kinetic energy, we need the mass of light too. Again what's the mass of light? – Krishna Deshmukh Oct 3 '18 at 15:08
• Have you checked this well written answer: quora.com/Does-light-have-temperature .Also: physics.stackexchange.com/questions/59456/… – user190081 Oct 3 '18 at 15:23
• Temperature is the mean kinetical energy of the particles. For visible light, it is some thousands C. The mass of the light can be calculated from $E=mc^2$, and typically you know the energy (for everyday sizes, it is very small - the largest atomic bomb radiated some kg of light away). – peterh Oct 3 '18 at 15:47
• @peterh $mc^2$, where $m$ is the invariant mass, is not kinetic energy — it's rest energy. And for light it's zero. – Ruslan Oct 3 '18 at 16:06