Will be absolutely fine for fixed grades. The contrast is reckoned to be in-between a condenser and a cold cathode which is a good thing and Ilford, (when they still manufactured these wonderful heads), used to recommend setting the filter to grade 4 for the best light. To be honest, I normally set it to grade 2 on such occasions, but that is usually for lith printing on Seagull. Best to do a test on different grades and see it there is any difference. I certainly wouldn’t want to remove the very delicate and easily damaged filters, unless you only ever want to print with graded papers. If so the grey metal holders are easy to remove with a small screwdriver.