It was determined in another thread that the light source on my Beseler 23c II is too bright. I've done some research and find people recommending a light bulb with less wattage, but no one knows where to get such an animal. The other option is to use a ND filter.

The filter compartment on the 23c is 5.5x5.5". I'd rather not mount a filter under the lens. ND filters of that size would cost more than the enlarger is worth. I'm going to need to dampen the light by 3 or 4 stops.

Does anyone know of a more economical light dampening material, that won't affect the color of the light?