Power: 40 watts equals 40 x 24hrs. x 365days
(350 Kwh) 20 years needs 7,000 Kwh @ $.07
per Kwh ($490.00)
Installation: 2 hours of union electrical worker
Rate assumed to be $50.00 per hour ($100.00)
Test/Maint: 1 hour per year of union maintenance worker
Rate assumed to be $25.00 per hour ($500.00)
20 year cost: $1,090

LED Costs

Power: 2 watts equals 2 x 24hrs. x 365days
(17.5 Kwh) 20 years needs 350 Kwh @ $.07
per Kwh ($24.50)
Installation: 2 hours of union electrical worker
Rate assumed to be $50.00 per hour ($100.00)
Test/Maint: 1 hour per year of union maintenance worker
Rate assumed to be $25.00 per hour ($500.00)
20 year cost: $624.50

Self-luminous Costs

Power: $0.00
Installation: .1 hours of union electrical worker (could be
substituted with a lower priced worker
i.e. a maintenance worker) $5.00
Test/Maint: $0.00
20 year cost: $5.00

Simply multiply the number of signs in the facility by the 20 year cost and then compare the totals. Self-luminous signs are by far the most economical choice even when factoring in the somewhat higher initial cost. Neglected in the above analysis is the cost of the wiring material. To each final figure, add the initial cost of the product to get total costs.