The modeled repair route is 0.0625 kg CO2e per service unit versus 0.09 for new. Its modeled reduction is about 30.6%, but a 40-unit repaired life reverses the choice. A defensible brief therefore recommends checking useful life and transport evidence before making any public claim.

Critical check: All comparisons use the same functional unit and clearly label invented factors.

Final project: Deliver the return map, normalized comparison, sensitivity table, supplier request and a conditional pilot decision. Add a new transport assumption of 4 kg CO2e for repaired lamps and explain whether the 80-unit route still improves on new.