Buying a used bulb. Hortilux Sodium bulb.

So the bulb has only two grow flowering cycles on it.

so if they grew two flowering cycles, at 10 weeks, 7 days a week @ 12 hours a day, thats 840 hours a grow

so thats 1680 hours

average hours is 24000 hour lifespan

bulb is $15, that a pretty good deal?

As a rule I don't buy used bulbs. Do you know for a fact that it does work, if so can you be certain of the amount of hours that are on it?

you dont buy used underwear, used bulbs are a rip off

Used bulbs are generally not a good idea but for $15 , that's not a bad deal . It will give you a bulb to use for now while you save up for a new one. It's better than not growing .