I have a Canon EOS 2000d, and am a total noob to photography. I basically all my life just used cams doing everything automatically (and being unhappy with wrong focus or bad color settings etc ;)).
Now I have a bunch of flash lights that I'd like to get comparison shots of (their spot illuminating roughly the same area) and then assemble all into one big image. Photographed in more or less darkness, except the flashlight, of course. The lamps have different light colors (all nominally white, but some more blue-ish, others warmer), different spot sizes at same distance, and different output power.
So I guess I need to set up all things manually, to not allow the cam to change the settings and make a comparison moot.
What kind of parameters do I need to set up for this, and how?
Edit: Note that I do mean flashlights as in, mostly hollow, cylindrical object with cylindrical battery put inside, LED head on the front. I want to assemble a photo that shows the different illumination that different flashlight models produce, as in, spot size at distance X, and perceived brightness of what is being illuminated. Thanks for the hint, Canina.