The colour depends on the properties of the semiconductor, and these can be tuned to produce light that is similar to natural daylight but with virtually no ultraviolet or heat.
White is another roof colour used to fight both the urban heat island effect and global warming in general, by simply reflecting light back into space.
白色可以直接把光反射到空中，也通常是一种被用来对付城市热岛效应和全球变暖的屋顶颜色。
3
To create a heat map, simply take any model of the system and shade or colour different areas of the model to indicate the ease or complexity of working on different each area.