Originally Posted by megido
I have a late grey version with white base.
So do I.
I think the way it works now is how it is supposed to be. I was wrong before to say it would be more logic if it turns off while exposing. Probably this indicator scale was built to quickly bring your enlarger up or down to the decided indication number. To do that correctly, to fine tune, the bulb must be turned on during the entire operation.
Remember, this enlarger was used in many newspaper darkrooms, where speed was important. Perhaps that is what this device was all about.
Sometimes the indicator comes with the wrong bulbs, too bright! They need special bulbs, weird looking things which I believe are called signal bulbs . . . these take a moment to reach the full brightness, the light is soft and yellowish