I had one once, that caught fire, and was leaking hot oil out of it as I was changing it.....wow did it make a mess as I let it drop free (from 35 feet up) it hit the floor, still smoking hot....OMG......the starters in the old sodium high bay lights aren' any fun either
Our maintenence staff spent the better part of two years removing every ballast and changing to no ballast LEDs and every bulb to LED.
We have realized a savings or $40,000 a month.