True red glass, not painted or coated (Except the 250W which is lacquered)! Zoo Med's spot reflector focuses more heat into your enclosure and minimizes nighttime glare. Ideal 24 hour heat source for all types of reptiles, amphibians, birds or small animals. Very little visible light provided so as not to disturb your animals sleep patterns. Excellent for nocturnal viewing of all types of captive animals.