Alternatively, this effect can be achieved with two lanterns equipped with scrollers (a device which fits on the end of the lantern capable of holding different colour gels and switching them during the performance) each containing a warm and a cool gel. However, scrollers are renowned for breaking unexpectedly in the middle of shows, and are also very noisy in operation, making them often unsuitable in a quiet venue, and therefore in a best case scenario two lanterns from each side should be used. Having said this, smaller theatres with fewer resources use this method to great success with only two lanterns per area of the stage.