Lighting Calculations, Inverse Square, Cosine, Efficacy & Lumen Method for Design Explained 

Lighting Calculations an Inverse Square Law, Cosine Law & Lumen method. Explanation of colour rendering, Efficacy (lumens per watt). A simple guide to lumens, Lux and colour temperature. All shown with examples of calculations and their respective explanations. How many lights do you need to light a space in a room, simple calculation to help you decide. Ideal for all level 3 electrical principles classes City & Guilds or EAL. Recognise and interpret information provided by lighting manufacturers, this will help you to decide what light is better.