Public Lighting
Ripple control switching
For switching of outdoor public lighting communities have profited several decades from the ripple control provided by the grid operators. Ripple control is being phased out and replaced by IoT solutions. This is cost-effective, because switching usually consists of only one or a few switches in the MV/LV distribution station, feeding separate conductors to the public light posts.
Dimming systems
Dimming has been a different issue. Many RF mesh network based systems are or have been on the market, all failing trials on cost, reliability and ease-of-use. Also high-frequency PLC and cellular systems have attempted to provide a solid business case for dimming, and all have failed. The initial cost of the system and maintenance and other operating cost are simply too high to offset the achieved energy reduction.
LED Failure to provide a business case has ironically partly been caused by the introduction of LED technology. Because of the extreme reliability and longevity of LED there is no use anymore for bidirectional communication: The LED’s and drivers are simply more reliable than the network monitoring them. Also the reduced energy consumption has made it more difficult for a dimming system to provide a business case.
Energy cost LED lamp
A typical outdoor LED lamp generates 6000 lumen and uses 40 Watts to do so. The lamp burns approx 4000 hours per year and a typical dim profile provides 50% energy reduction. Over 25 years and with a kWh price of 4-10 eurocents the dimming energy savings amount to 80-200 euros.
Business case DigitalTF
DigitalTF provides the dim signal for approx 0,15 euro per year, amounting to 3,75 euros in 25 years. Adding a SaaS service to operate the DigitalTF transmitter is divided over all connected lamps, on average 30 per MV/LV distribution station. This increases the control cost slightly, but still provides a very solid business case.
Business case IoT It is obvious that any IoT solution with at least 8 euro/year cost excluding hardware and SaaS will never create a positive business case. Many manufacturers of mesh RF and PLC systems want to create the perception that their systems are less expensive than IoT, but this is not true. The OPEX (maintenance) of such a system is so high that it offsets the benefit of a providerless solution.
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