A purple wave of faulty streetlights has swept across the USA, generating incorrect theories, bad lighting and fans of an accidental aesthetic.

From an energy-efficiency standpoint, there’s no comparison. But it may be the case that initial adoption in streetlights ended up being too bright and too blue.

After examining a few streetlights removed from service thanks ... which emits a deep blue light. The defunct units all showed signs of phosphor degradation. In some cases, the phosphors seemed ...