They don't render colors, makes them unattractive for general lighting applications. They're exceptionally efficient and cost effective, however. Many people,

They don't render colors, makes them unattractive for general lighting applications. They're exceptionally efficient and cost effective, however. Many people, myself included, find the limited color spectrum makes much better at not destroying nightvision and lack of blue light results in clearer seeing (while the blue-heavy light from LEDs is particularly bad).