These two gadgets might look similar on the outside, but sunrise clocks and other wake-up style lights are for waking you up, while a SAD or seasonal affective disorder lamp is designed to simulate sunlight for you during the day. SAD lamps perform light therapy to help combat seasonal depression during darker times of the year, while sunrise alarms are just for making morning wake-up less rough. Both can help regulate your circadian rhythm, but in different ways. You could set a sunrise clock to stay on all day to help simulate sunlight, though these don't promise the same benefits and you might not get the help you're looking for.
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