Leopard gecko heat light wich is best?

i have a black heat light for my leopard gecko and also a heat mat but the heat light bulb looks black when its off but once you turn it on it look's purple i need to know if leopard gecko's can see purple or not...I also need to know if i should leave the heat light on all night will it let him sleep if he... show more i have a black heat light for my leopard gecko and also a heat mat but the heat light bulb looks black when its off but once you turn it on it look's purple i need to know if leopard gecko's can see purple or not...I also need to know if i should leave the heat light on all night will it let him sleep if he wants to?
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