According to the Small Business Administration…
Lighting is a critical component of every small business. Employees must be able to see to perform their jobs, and objects and spaces must be aesthetically pleasing to encourage sales.
Depending on the type of business you operate, lighting accounts for 20% to 50% of electricity consumption. This means that significant cost savings can be achieved with energy-efficiency improvements, and due to continually improving equipment, lighting usually provides the highest return-on-investment of major upgrades.