I upgraded the headlight of my Ignis from stock 55/60W H4 halogen bulbs to Osram H4 4200K WW LEDriving HL XLZ 3.0.I ordered ...

Analogous to the cavity resonator, this requires reflectors of high reflectivity, small absorption, and adequate size. Stacked dielectric plates, and stacked planar or rod gratings are shown to be ...

The images show ultra-fine bright and dark stripes (called striations) in the thin, gaseous layer of the sun's atmosphere ...