Projection TVs: Large projection sets and portable projectors use expensive bulbs with limited life spans, and it's impossible to know how close they are to burning out.

投影电视：大型投影电视机和便携式投影机使用昂贵的、使用期限有限的灯泡，不可能知道离这些灯泡烧掉的时间有多远。

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In comparison, Rear-Projection TVs (RPTVs) lost market share, going from 2.9 percent to 2.5 percent.

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For larger TVs, projection TVs are more efficient, consuming half the electricity of plasma or LCD models.

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All that would be needed for a holo-conference would be an array of spinning mirrors and projection TVs set up around a table.

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