This article demonstrates the calculations you would need to do to work out the return on investment for buying LED.
In this example we review whether or not it is cost effective to upgrade your fluorescent ceiling lights to LED panels.
Assuming the room was already using fluorescent lights, I compare the cost of replacing all of the tubes with the cost of fitting new LED panels.
The LED panels are more expensive but gradually their lower energy bills payback the upfront investment. Once this is reached the rest of the panels’ life gives you a cost saving.