Originally Posted by Rick Olson
The V28 is similar to the ULF-28 in many ways but it uses a metal halide light source. The CWX of the ULF-28 has several advantages, which you can read about in the article at unblinkingeye. The ULF-28 is also a multi-purpose exposing unit in that with the use of appropriate options it can also be used for exposing VC silver papers (with light integration and vacuum) as well as alternative processes. The conversion is made by switching to a low-power tungsten light source.