LED lights
The photosphere gives off heat and visible light.
lomentwist
energy
light and heat energy
it gives off radiation
The planet that gives off its own heat and light is Earth. It receives light from the Sun and reflects some of it back into space. Earth also generates heat internally from radioactive decay and geothermal processes.
Bioluminescence - if it gives of visible light. However heat is also light and metabolism itself therefore gives off light, but you can not see it because it is infrared light.
Yes.
Energy
It makes thermal energy (the heat), radiant energy (what we see), which is in essence more or less the same manifestation.
The sun. All other objects reflect heat and light from the sun.
The electrical energy input which is meant to turn the lights on is not 100% used (since no machine is 100% efficient.) Most of this energy is wasted as heat energy.If a substance reaches a certain temperature it gives off light and heat. When a filament light bulb reaches that temperature, it gives off both light and heat