The 60W is a common wattage used for corn snakes, but this ultimately depends on the distance of the bulb from your pet. If the light were to be placed too near to an enclosure, it might cause it to become too hot for the reptile. A good indication that it is too hot or uncomfortable would be if the reptile is always found in the cooler areas of the cage (under a rock, in a shadow, in the water dish). Fix this problem immediately either by moving the light further away or purchasing a bulb with a lower wattage.