Flicker Lab Instrument Test Equiptment is designed to precisely measure fluctuation or flicker en light sources. Flicker is the modulation in a light's intensity that can be imperceptible  to the naked eye but may cause discomfort, headaches,  or  interfere with the performance of cameras and other sensitive equipment. Manufacturers and laboratories use such as instruments to ensure that lightning products (like LED lambs, fluorescent tubes, etc.) comply with regulatory and safety standards (such as IEEE 1789 and EU Ecodesign Directive,  US  Energy Star,  and other guidelines).