Lighting rules of thumb vary depending on the type of space. For example, offices typically require 1.5-3.0 Watts/ft², while precision manufacturing spaces require 3.0-10.0 Watts/ft². By using the appropriate rule of thumb for the specific space type, designers can estimate the lighting load and design the HVAC system accordingly. It’s essential to consider the specific requirements of each space, including the type of lighting, occupancy, and activities taking place.