Or it would be better if the pet shops were fully trained.
More and more morphs are being purchased especially of albino variety. Albinos are much more sensitive to light(they would hide a lot). Corns are most active at dawn/dusk so you would hardly see your snake if you have a blinding UV light.
If you want a light to see your corns better, use a night light (Blue or Red bulbs) although make sure they have protectors as corns like to clamber around them.
If you ever need advice on any herps always ask private breeders or people you know have had many years experience. Private breeders are not out to make money, they breed for enjoyment. Countless herps die each year due to wrong advice given to new owners by big petshops or under-prepareed new owners.