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I've been using a homemade unfiltered blacklight exposure unit with a vacuum blanket for years now, but just finished a job (simulated process on black shirts) that I had a tough time with the darker toned areas - say above 75%. Additionally, doing any kind of gradient oftentimes results in a rather abrupt cutoff on the lighter end. At any rate, I'm considering purchasing a commercially made metal halide exposure system to maximize screen quality regarding halftone reproduction, and have narrowed it down to either NuArc's 3140 or Amergraph's AdVantage 150. The specifications for both are almost identical, but the NuArc is considerably more expensive. I'd appreciate any comments, both positive or negative, from owners or users of these two units. While there are plenty of workarounds to buying a commercially made unit, it's interesting that it seems as though everyone who buys one says they can't believe they got along for so long without one, and that it's one of the best investments they've made.