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SIEMENS '^rrY forG'{e Understanding of Need Experience Richard O'Hearn, Senior Energy Engineer, has extensive experience in fixture selection, and will be performing the analysis and evaluation for the City. He is well acquainted with California and SCE. His most recent experience is with the City of Huntington Beach, where he performed the initial design and analysis, helping the City to choose the most efficient fixtures possible, as well as provided lumen and output analysis. He was also instrumental in the cut -over process, and worked closely with Huntington Beach to ensure they received the best rates possible from SCE. The following Information, written by him, is a direct example of his knowledge in the field. Data Driven Siemens' first step is obtaining any recent data of the existing lit anvlronment as possible; more appropriately data that has Geographical Information System (GIS) attributes. This Includes both fixture Inventory and local community data & information. Inventory data is what Siemens uses for any street light project that Is — at its core — a one-for-one energy conservation measure under the assumption that the customer is generally satisfied with the existing lit environment. Incident data — both vehicular and crime — is incorporated into the project in an attempt to help the customer improve their existing lit environment. Inventory & Applications There exists two elements to the existing fixture inventory from SCE — which is the billing Inventory— and what Is actually out in the streets today — known as the field inventory. These need to both be considered when applying methodologies aimed at the economic and quality -of -light objectives of the City of Santa Ana. While the majority of the data between these two sets will prove to be equal, Siemens' experience has shown that there is going to be variances. The billing inventory Is what will be used by Siemens to confirm the economic benefits of a street light conversion project. In some instances, utility customers in California are eligible to receive up to three years' worth of incorrect billing charges, where differences occur. Siemens can help facilitate the discussions around these reconciliations, between the customer and SCE, and as the customer's liaison. The field Inventory however, will be used to determine the baseline lighting condition and inform the selection of the appropriate LED equivalent fixture. Siemens' design philosophy is to assist our customers in determining the appropriate balance between lighting levels and energy savings, based on available field data. This is a collaborative process between Siemens and key stakeholders, which utilizes relevant design guidelines as reference such as the Illuminating Engineering Society of North America (IESNA) RP -8 guidelines. The community's goals and site-specific variations are taken into account, such as school areas, crosswalks, or public safety/crime issues, In order to minimize the Impact felt by residents of the City after a change of light source, the equivalent LED lumen output should start with on the perceived lumen methods, created by the Lawrence Berkley National Laboratory in July 19961. This approach includes the consideration of the quality of light produced from all light sources — existing and LED — in an attempt to provide a lit environment that is as close to the existing one, or in many instances Improved when the application allows for it. Areas where a statistically significant amount of vehiclelvehicle or vehicle/pedestrian/cyclist incidents occur, Siemens will review with the customer and in comparison to the best practices found in the applicable IESNA library, While the nighttime lit environment may not hold the fault for these incidents, reviewing the existing light levels and proposed solutions can help improve the conditions. Using available GIS data, Siemens will review the existing lighting inventory in map -form to locate any "odd ball" wattages that may have come about over the decades of the existing system being in place. 1 Reengineering of lighting Photometry, S.M. Berman, LBNL-42327-L-213 Page 16 55A-372