I have a Durst Laborator 1200 with CLS450 color head that I find is too bright. Two or three stops down on the lens (f/8-f/11), I get down to exposure times of just a few seconds. What is the best practice to reduce light output? 1) Stop down the lens? How about diffraction? For right or wrong, I am not comfortable going smaller than f/11 due to diffraction. 2) Replace the bulb. I currently have a 250W bulb and it seems there is also a 200W bulb for this socket and voltage (Gx5.3/24V). How much difference would that make? If light-output is approx linear with power, I would only loose 20% which is about 1/3 of a stop, not that much. 3) ND filter seems like a solution, but I generally don't like the idea of putting a filter under the lens. 4) Some other solution? Can I modify the enlarger head or enlarger somehow? Anyone else who has had this problem and found a good solution? All input is welcome!