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LED Downtown Globe Analysis

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					LED Sidewalk Light Replacement Analysis

Data Box
Existing 100 watt HPS
Wattage
bulb life =                        2 years
bulb cost =                  $37.18
Ballast life =                     5 years on 50% of the lights
Ballast cost                 $59.00
Ignitor life =                     5 years on 10% of lights
Ignitor cost =               $35.00
LED 56 Watt Replacement
Wattage                         56
LED bulb life =                  10 years
LED bulb cost              $460.00

ENERGY
From DTE rates
Energy Only                 $0.0241 watt/month

Surcharges
Nuclear Decom                            0.27%
Rate Increase Surcharge                 10.96%
Reg Asst Surcharge                       1.26%
                          total =       12.49%

Change bulb from                100 watts to                   56 watts =         44 watts saved
10 year cost                $325.31                       $182.17             $12.72 per year
                                                          with surcharges =   $14.31 annual energy savings
MAINTENANCE
Existing 100 watt HPS
bulb life                         2   years
bulb cost                   $37.18
Ballast life                      5   years on                50% of the lights
Ballast cost                $59.00
Ignitor life                      5   years on                10% of lights
Ignitor cost                $35.00
Replacement Labor                4    hours                $38.49 per hour
Labor cost                 $153.96

Equipment- Aerial Boom           2 hours                   $28.58 per hour
Equip cost                  $57.16
Per bulb labor & equip     $211.12


LED 40 Watt Replacement
LED fixture life =               10 years
LED fixture cost           $460.00
Comparison using                      1      lamps for           1            years

Continue with existing bulb
                                  Number       Cost
bulb replacements                     0.5      $37.18             $18.59
bulb labor & equip                    0.5     $211.12            $105.56
Ballast                               0.1      $59.00              $5.90
Ignitor                               0.1      $35.00              $3.50
                                                                 $133.55


Change to LED Bulbs
                                  Number       Cost
bulb replacements                     0.1     $460.00                $46.00
bulb labor & equip                    0.1      $56.30                 $5.63
                                                                     $51.63

                                 Maint saving                        $81.92
                                 Energy saving                       $14.31
                                              Total                  $96.23   for       1        years
                                                                     $86.61 Assuming a 10% failure rate
                                               check                 $96.23   for       1         year

                     Payback =        4.39 years         $            7.05 Sues calculated payback
                                 Mikes wish

From Mike Bergren - Estimated cost of maintenance of 100 watt hps street lights. Change a
bulb about every two years at $25.00 each. Change a ballast about every 5 years on about
50% of the lights at $59.00 each. Change an ignitor every 5 years on about 10% of the lights
at $35.00. The labor for the above is about 3 to 4 hours.




Relamping Efficiencies
Original = 2 people for 2 hours: 1 hour to change a light + 1 hour set up and tear down
2 man crew spends whole 8-hour day replacing lamps
leaves 7 hours to retrofit 7 lamps

Total cost:
Labor                               $76.98 per hour (2 man)
Equipment                           $28.58 per hour
                                   $105.56 x 8 hrs =                                  =
                                                                      $844 / 15 lamps$56.30 labor and equip per lamp
                                                                           x 1.92 = $108.09 per 100-watt retrofit
Relamping Efficiencies
Original = 2 people for 2 hours: 1 hour to change a light + 1 hour set up and tear down
2 man crew spends whole 8-hour day replacing lamps
leaves 7 hours to retrofit 7 lamps

Total cost:
Labor               $76.98 per hour (2 man)
Equipment           $57.16 per hour
                   $134.14   x 8 hrs =     $1,073      / 7 lamps = $153.30 labor and equip per lamp
                                                        x 1.92 =   $294.34 per 100-watt retrofit

				
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posted:9/6/2012
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