An older office's 4-foot T12's are to be replaced with direct wire LEDs because the ballast cost + labor can be avoided. The instructions indicate that the hot is wired to one end and the neutral is wired to the other end. Because they are T12 fixtures, I believe they are non-shunted tombstones (sockets)
The new wiring configuration will be augmented with a sticker to indicate that only LED bulbs can be used and not to use T12 bulbs.
If the sticker is ignored and a T12 is installed in the new wiring configuration: 120V AC applied to each end of the bulb, will this result in a safety or fire hazard when the 120AC power is applied to the T12?