the new blub for cold lights (single tube) is called the V54 from Aristo. It has a better response for the VC papers. It is more green in its coloration. You will still need to use multicontrast filters either in the filter drawer or under the lens. The cost for this upgrade is about $100 US. Should be a snap to change out. A 40 yellow should help but this will dramatically slow down the light response while printing as it will filter the blue light.