Hi! i bought a while ago a very basic BW enlarger (condenser type), and it came with no light bulb in it. i tried the first bulb I found around the house (a 60W clear) and (obviously very dark, it was just a test) I saw the light wasn't properly spread in the projection of the light. I changed the bulb for a 75W diffused bulb and it looked a lot better, but still there is a slightly noticeable gradient of light at it's projection. Would moving up to a 100W bulb solve this? What bulb do you recommend? In the instruction manual it doesent specify the type of light bulb, it just says 100W maximum. please shed a bit of light to this issue. Thank you!