The KV-5200 utilizied newly developed phosphors for a brighter, high contrast image with no increase in energy consumption, maximum 27 watts. It also utilizes alternating, vertical non-reflecting “guard bands” with the phosphor strips which absorb ambient light reflections. In other words "black matrix".
Still, if you are lucky to find a 5000 or 5100 with lower hours, you will find they produce very vivid images.
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