Showcase lights are installed internal to a merchandise display case. They provide illuminance to attract customers and aid in evaluation of merchandise. Illuminance levels on merchandise is generally three to five times the illuminance level of surrounding ambient light. LED showcase lights are usually linear light fixtures constructed with LED modules housed in aluminum profiles. The LED module is a linear assembly of LED packages on a flexible printed circuit board (PCB) or metal core printed circuit board (MCPCB). The aluminum profile is fitted with a polycarbonate or acrylic lens which protects the LEDs and provide optical regulation if necessary. Typically, diffuser lenses are employed to evenly distribute light from the LEDs. Accent lighting is used in some applications to create a dramatic emphasis on merchandise. Jewelry stores, for example, use the impact of feature lighting to create sparkle in gemstones or crystal. This task is accomplished by miniature LED spotlights which deliver a punch of narrow-beam light.