Simulating a 40W Light Bulb Let's say I have a light bulb at home that I want to add as a light source.

Specs:


40W incandescent light bulb
5cm in diameter
Color temperature of 2700 kelvin


What values should I enter into Blender to have this simulated properly?

I will accept an answer explaining this for Cycles, together with how the conversion of my numbers above into Blender was done.

Bonus points for Eevee settings as well, which are not the same IIUC.

NOTES


Just filling in 40W in the Blender light settings is wrong and will not work.
The light "Size" setting in Cycles is documented as being the light radius, not its diameter.
Simply convert Lumens to radiant flux.

Set Color to white, Power to 1W [link], and Size to 25 mm
Enter 450 Lumens (energy emitted by a 40W incandescent lightbulb)[link]
Divide the Lumens by 683 to get radiant flux [link] (which is used by Blender)

You can use Blackbody node to specify the 2700K color temperature.

Sources:

Cycles, unit of light energy ATTN: Brecht
Why Watt as light value - Comment by Troy_s
CG Cookie - How physically based, photometric lighting can improve 3D renders