The whole fixture must be replaced—lightsource and luminaire—and this is never an inexpensive proposition.
整个装置——光源和灯具——必须换掉，而这一提议绝不便宜。
2
If what they're saying is correct, which I believe it is, things like the lightsource are going to strip atoms from the inside out.
如果他们说的是正确的，就像我所相信的，像光源这样的东西会把原子从内部剥离出来。
3
The lightsource must therefore be immensely brighter if it is to be used as a headlight to illuminate the path, than if it is to be used as a signal to others.