The only real disadvantage of an LED bulb is its upfront cost. Before they were banned, traditional incandescent bulbs cost around $1 to $2 per bulb. LED bulbs, in comparison, cost $3 to $6 per bulb (though you can find some for as low as $1 per bulb when purchased in bulk). Of course, LED bulbs more than make up for that cost difference with a far greater lifespan than incandescent bulbs.