How do I choose a lamp?
Farnell, RS, etc stock plenty of suitable bulbs. You need 28V * 0.2A = 5.6W so a bulb rated for 28V at around this wattage.

Here is one rated for 28V/6.44W, so 0.23A. Here is a page with similar options. If you decide you need one of a different rating (although I selected a few different wattages between ~4-10W) simply change the search filters.

Noticed you are in the US, so here is one from Newark too.