Working out your savings

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Installing controllers in lighting installations gives consistent overall steady savings - savings from stabilisation, electrical energy saving, cuts in lamp maintenance and replacement costs.
 
You can calculate the total annual savings you get with the Reverberi SEC STP power controllers

Overall Annual Saving =
 
Electrical energy saving

(Pa x tr x Re% x $/kWh) +
 
Maintenance saving

NL x {[(Cl + Cm) : t2 - (Cl + Cm) : t1)] x (tr + tn)} +
 
Saving from stabilisation

(Pa x Rs% x tf x $/kWh)

 
Key:
 
tr = number of hours of operation at a lower rate per year
$/kWh = cost of one kWh of electric energy
Cm = lamp replacement cost
t1 = average lamp life with SEC STP
Rs% = percentage of stabilisation savings
NL = number of lamps
Pa = total power
Re% = energy saving percentage
Cl = lamp purchasing cost
t2 = average lamp lifes without SEC STP
tn = number of hours of operation at regular rate per year
tf = number of hours of operation per year