Workers at the Santa Cruz (California) Wastewater Treatment Plant haven’t just seen the light, they’ve measured what it costs to operate.After energy-efficient lighting was installed outdoors, Mike Sanders was confident the plant could cut electricity costs some more with a similar conversion indoors. It worked. The new lighting systems have produced measurable savings, inside and out.The outdoor lighting project, which converted 82 high-pressure sodium and mercury vapor lights to DuroSite LED fixtures (Dialight), gave better light and saved nearly $17,000 the first year. It also reduced maintenance costs significantly.The next budget year, Dialight replaced 120 high-pressure sodium indoor lights with
