The following information is current as of December 1989, and relates to the comprehensive street light conversion program in the City of San Diego.
Information is directly from city staff.
The conversion is nearly finished. Only about 1700 old fixtures remain to be retrofitted out of a system total of about 31,000. They have made a comparison between the LPS retrofit and a similar retrofit if HPS fixtures had been used. All lamp wattages were compared based on equivalent lumen output. The payoff period to convert to LPS is approximately three years, to HPS it would be six years.