optical lens the screen device may be configured to absorb a portion of the focused illumination such that illumination to an upper portion of the trailer interior is reduced the rotationally self correcting screen device remains in a horizontal orientation even if the housing is rotated one benefit of the disclosed dock light assembly is that forklift operators working in the trailer interior are shielded from high intensity light even though the lower portion of the trailer interior remains brightly lit application_number US 201715609454 A description the present invention is directed to a dock light and more specifically to a high intensity light which is adapted to be mounted inside a warehouse adjacent a door on the loading platform which is adapted to extend in an adjustable manner outwardly of the warehouse to shine into the interior of a truck backed up to the loading platform the dock light is designed with a screen device to shade an upper portion of the beam field so as to protect forklift operators from the high intensity light because the light assembly is affixed to a flexible tube which allows rotational movement and the screen device within the lamp assembly should remain substantially horizontal the screen device is designed to auto correct for rotational movement fig1 depicts a prior art dock light assembly 10 having a high intensity halogen bulb the dock light.