‘Nothing is possible without light! This basic principle applies to all life on earth, but also to photography, filming or the electronic recording of images.’ … ‘The use of correct exposure settings, e.g., how much light passes through the aperture, is decisive for film aesthetics. Unlike massive Hollywood movies, small film productions seldom have the resources to influence the lighting conditions with dozens of artificial lamps. Most television productions make do with a handheld light or lightbox with three individual lights.
(Source: https://www.camgaroo.com/camgaroo-academy/artikel/details/lichtworkshop-natuerliche-lichtbedingungen-richtig-nutzen/)
Low-budget film projects often utilise the existing light (natural/artificial). The creative use of light sources is decisive for the quality of the recorded footage.
Three-point lighting and reflectors are the essentials of light engineering. Further information can be found here.
Check filming location, weather and light. Test and pack the hardware, e.g., lights, reflectors. Practice light engineering.
Pick a well-lit spot for shoots, for example, during interviews.
Die 3 Punkt Beleuchtung - Grundlagen der Lichtsetzung: https://www.youtube.com/watch?v=fV4ummbhI1U
Licht beim Filmen (Youtube Video): https://www.youtube.com/watch?v=jxeUwBE0FJQ
Aufbau eines 5-Leuchten-Systems: http://www.portablestudio.de/5_Leuchten-Aufbau.html