Investigating lighting and camera accessories

what is the purpose of:

lamp/ modelling lamp
helps maintain consistency, if time of day changes then this maintains lighting.
used to light up the subject of your photo and therefore produce a better-quality image. 
This is cheap but it often produces heat which might be uncomfortable for the subject. 
consistency in colour is important as there is different coloured bulbs which must remain the same for the shoot.

flash meter

umbrella

reflector

one light set up

two light set up

soft box

3 light set up

key light: the primary source of light, main light

fill light: fills in any shadows

backlight: helps with sharpness and dimensions of image

tripod: stabilise the camera

monopod: basically a selfie stick

flashgun: external flash used to improve lighting
batteries: powers camera