You must know how to use lighting and grip equipment While filming, the role of lighting is very important as it can help in capturing the emotions of the scenes properly. There were many films, which could not make an impact on the viewers due to improper lighting in spite of using the best actor and actresses. Therefore, before the start of the shooting, the director and camera man must have proper discussion about the lighting and gripping equipment.
You need to use proper lighting source with the key grip and you have got following sources of lights.
Tungsten light This light is orange in colour and generally used for filming interior lighting situations.
Hydragyrum Medium Arc Iode (HMI) Colour of HMI light is blue and it is used for showing daylight condition. However, you must remember this type of lighting are very expensive to rent. Therefore, use them only in the situation where needed.
Fluorescent Most of the ceiling lights are fluorescent lights and therefore in order to balance the colour of any scene, you will need additional amount of fluorescent light and you need
to properly balance your light by varying the colours of different lights to get right kind of effects. Click on this link to get full info. 
Light Emitting Diode (LED) LED usually takes least amount of energy and out of all the lights mentioned above is the coolest one. You can easily tough these lights. However, they are not yet available in larger sizes. It can be used for daylight or indoor lights in any film scene. However, LED lights are not so powerful and suitable for close up scenes only.
You must use right light sources in the film shooting.