The 2004 model has a strand capacity of 400 while the 6004 will hold 450 fiber optic strands. The 6004 has a metal halide lamp that is rated at an average of 6000 hours. The quartz-halogen lamp inside the 2004 is rated at 400-700hours average. The 6004 model is more energy efficient than the 2004 and consumes less power.
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