SHADOW-CASTER underwater lights do get warm and rely on water immersion to stay cool. However, if your lights come out of the water when running on plane, the small amount of splash they receive is enough to keep them cool. SHADOW-CASTER underwater lights utilize a thermal protection circuit and will reduce their output so that they never get hotter than a hot cup of coffee. This feature makes SHADOW-CASTER underwater lights worry-free and prevents about them hurting you or damaging your boat.