Start with what should improve
Identify areas that are difficult to see, uncomfortable, expensive to maintain or lit when nobody uses them.
Review the positions
Existing mounting locations may be reusable, but their spacing should be checked against the proposed light distribution and the tasks below.
Look at the whole installation
Consider electrical compatibility, controls, maintenance access and any work needed by a qualified installer.
Assess energy use with real inputs
Compare verified system power and operating hours, including the effect of controls where supported. Any saving or payback estimate needs clear assumptions, costs and the actual project conditions.