I know I could have them made. But I would not want to!
The problem is volume. With low production, the cost is high. High cost is lower sales volume.
It would take a long time to sell only a few thousand pieces.
Like the 36V or 60V people,
Some people would want 7W, other people would want 11W, 13W or 23W.
Some would want a looped tube, some would want a twisted tube.
Some want North American bases, others want European bases.
Some want this Kelvin, some want that Kelvin...
It would tie up a lot of money in a bulb style or 2 that would have a very limited market.
I am not certain many 48V users are wired for using 48VDC loads. I figure most 48V users are wired for an inverter to feed the loads.
G-