H.A.F.
a.k.a. Rusty Nails
I think the other concept is that the horticultural ones are designed for extended continuous use. But there are regular "not scary for grandma" light bulbs that are being marketed as grow lights in the hardware store.Yes; the type of diodes being used. Horticultural grade diodes have specific wavelengths in them that won't be used for general purpose lights and they have an IP rating that is more suitable for higher dust and higher humidity environments.
Probably great for seed germ and clones, but once you get into rigging enough wattage for a decent grow you're talking lots of table lamps and wires dangling from the tent ceiling