Anyone who has driven a car equipped with the old sealed-beam headlights from the 1980s will know that modern LED lighting ...

Sealed radioactive sources are either installed in devices that allow the source to move safely in and out of the shielding when the radiation beam is to be used, or in devices that allow a beam of ...

Anyone who has driven a car equipped with the old sealed-beam headlights from the 1980s will know that modern LED lighting technology is one of the greatest improvements of the modern automotive age.