No I only drive the aircraft but have noticed the more important the bulb the longer it takes to get a new one. And also the more important the bulb the less they carry in stock and if its mission critical they won't carry a spare.
The other thing that seems obvious to me is that if you install a double unit with 2 bulbs of the same batch the likely hood is they are going to fail at the same time. So you swap one of them after a month and carry 2 in stock. This then gives you at least 2 weeks to get more in.
But if you suggest concepts like this you get blank looks and "why do you want us to change a working bulb?" And bulb can be swaped for any unit mechanical or electrical which is a consumable unit.