Top 10 professional electrician - Service Blogs & Faq Pages - The CRI of an HID bulb can range from zero (high-pressure sodium) to about 65 (metal-halide). Since implementation of the project, color-rendering indexes (CRI) than HID fixtures. In 2008, Los Angeles began a project to retrofit 215,000 lights with LED lights. In an attempt to lessen crime and increase energy savings, many cities and businesses have started replacing traditional high-intensity discharge (HID) lights with LED bulbs, light engines, and fixtures. These actions have paid off. CRI refers to how accurately a light source reveals the true colors of objects, people, and surroundings. Electrical supply switches, conduits & sockets specifications, review information on residential accessories. LED fixtures are capable of having CRIs of 75 and higher. Lights with a CRI of 80 or higher are considered to show colors most accurately and increase visibility, which is especially important for security purposes and parking lot surveillance ..More