Kubota has a very similar light bulb on some of their tractors, I think the one in our L3830 is the same as that one. That one was also available in LED on Amazon. The one in there was intended to go in a four-wheeler or dirt bike of some sort.
On our B 7500 my solution was to make a bracket to go on the back side and attach a pair of 4in round LED flood lights, they push up to the same place as the old lights did and threw out a whole lot more light for about the same amount of power.
Aaron Z