The fat, four-foot fluorescent bulb is going the way of the 100-watt household incandescent -- into extinction because it is also an energy hog compared with its replacement. That's the good news.

Many fluorescent clothes had reflectors, she said, ... He said customers who were ambivalent about helmet colour would buy a white helmet as it is the most visible in low light.

Tiny, mirrorlike structures known as distributed Bragg reflectors reflect this fluorescent light as well as all the other light the photonic crystal allows to pass through.

Highly fluorescent pigment, whose peak excitation wavelength matches that of the blue of the sky, is infused throughout the slab. And layered structures, known as Bragg reflectors, sit about 1.5 ...