Popular certified electrician - Faq's - Diagnosis & Repair - The CRI of an HID bulb can range from zero (high-pressure sodium) to about 65 (metal-halide). 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. These actions have paid off. In 2008, Los Angeles began a project to retrofit 215,000 lights with LED lights. Since implementation of the project, color-rendering indexes (CRI) than HID fixtures. Discount electrical stores for electrical wiring installation, ceiling fans inspection, circuit breaker troubleshooting, faulty wiring. CRI refers to how accurately a light source reveals the true colors of objects, people, and surroundings. 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. LED fixtures are capable of having CRIs of 75 and higher ..More