Last year, on the occasion of its 150th anniversary, the National Museum proudly showed its completely renovated interior and exterior illumination system based on state-of-the-art LED technology. LED lamps make it possible to adjust the intensity of light separately for every painting or artwork to even better emphasize their appearance, significance and value within specific areas displaying many different attractions. As for the outdoor, LED equipment allow for a bright and vivid colour diffusion on wide surfaces with reduced power consumption rates and costs. Specified and installed by GRIVEN’s authorized dealer for Poland, PROLIGHT Sp. z o.o., 41 Diamond RGBW colour changers with narrow optics were chosen for the outdoor illumination of the National Museum. The protruding square pillars that ornate the outside façades of the building needed a narrow beam to light up their full height, enhancing their massive structure with bright, vibrant colours while fading away on the in-between spaces. Located at the base of each column, the Diamond units, owing to an easy adjustment of the inclination of the beam spread through the newly conceived articulated fixing yoke, allow a perfect and even colour distribution on the whole pilaster length up to the roof. Now the pillars of the National Museum stand out in a pleasant alternation of light and shadow, delivering an innovative allure to the whole building.