Replacement 360/370 lamp LED holders

AFAIK, the key specs for a bulb are the base/style, the operating voltage and current, and the "brightness" of the bulb. Most of which could probably be determined from a part number (if we're lucky) or with a bench supply (if not). (The brightness would probably also require a known reference bulb or two to determine, though.) I have some formulas around somewhere to derate brightness against voltage, etc., which I've used before to determine which available (modern) bulbs are the closest (if an exact equivalent can't be found). Also, anecdotal evidence (from PDP-8/E panels) seems to indicate that the values aren't even very critical. (Several people have used the 8/I bulbs, or other even more incorrect bulbs, and failed to notice the difference!) Vince