Determine installed lighting power by adding together the wattage of the fixtures in each of the space types, including increased lighting power allowances for decorative or merchandise display lighting. Be sure to omit exempt fixtures. Add up all t

Determine installed lighting power: Add together the wattage of the fixtures in each of the space types as listed above, except for the increased lighting power allowances for decorative or merchandise display lighting, which will need to be accounted for in a separate calculation. Be sure to exclude exempt fixtures. Sum all the wattage from each space type in the project to obtain installed lighting power.