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Hello Paul.  Long time no hear from you.  Yes it's a black back red spot.  That's what makes it so strange, it's a Hughes'/Smith's bulb.  Any idea how the red spots got on them?  There must have been a very bored airman one day.  It's not the old resistor spot code is it?  I find it hard to believe that I might have crept down one night and slipped it in there.  I don't ever recal having the Kollsmans, the Hughes, and the Smiths out at the same time.  Still anythings possible these days!  I almost bought two more 9V batteries this afternoon to try the Kollsman on 27V, but I had a last minute fit of meaness at the check out, so I'll have to wait until my next Amazon order.  I'm only looking for 80mA max, and I don't really need the counters light, so that would mean 40mA max.  On the led front, do you know the best voltage for cheap ultra bright leds, and do you need a resistor in series like the old ones?