But that may not matter too much. Lasers are more efficient than xenon lamps, which waste a lot of energy as heat.
不过瑕不掩瑜，激光的效率比氙气灯高，因为后者的能量很多以热能的形式散失了。
2
On top of that, lasers last for a long time, whereas xenon lamps burn out and need to be replaced periodically.
除此之外，激光能够持续更长时间段，而氙气灯较快燃尽，需定期更换。
3
When launched, Phoebus's projector is expected to be ten to 20 times more expensive than those that use a xenon lamp. But that, no doubt, will change as the cost of lasers drops.