The perfect light? Most lamps on the market are either at a kelvin number of 2000-2200K (warm white with an emphasis on warm) or at 2700-3000K (warm white with an emphasis on white). Some people think 2000K is too warm while others think 2700K is too white. With our Perfect LED series in opal glass, we strike the perfect balance between warm and white. perfectly balanced for the Nordic homes. The opal colored glass has great advantages when the light source is to sit behind a lampshade. The light gets a greater spread, which means that the shadows from the position of the lampshade are minimized.