Thank you for the information, it sure is helpful. Please bear with me, as I'm very new with the enlarger.
May I know for those with CLS 501 head, what's the average time I can expect for 8x10 sized print (ilford MGIV RC) from normal 6x6 negative (N, based on film testing), printed at Grade 2.5. I just replaced the bulb with a new Philips one, but I'm getting exposure time of more than 60 secs for a good print. I'm using 6x9 femobox, with 100mm componon-s lens. For the grade setting I'm using dual settings on Ralph Lambrecht's web site.
Also I'm noticing that even when I use the "filter out" switch, I can see the light is not totally 'white', different when I'm setting all the filter settings at zero. Just need to know if this is normal.
Again my apology, if these are 'elementary' questions, as I have search for answers but unable to find them.
Mansur