Lighting system for mass-transit vehicles

A method for installing a light pipe in a light fixture, the light fixture including an elongated lamp-support panel having an elongated slot extending through a thickness of the lamp-support panel and extending longitudinally along a length of the lamp-support panel;

• an elongated light pipe, an elongated mounting fin comprising an elongated stem extending from along the light pipe, the mounting fin further including an elongated apex defining a fin upper edge and a pair of elongated ramp surfaces tapering outward and downward from along the apex to an outer edge of each of two fin engagement surfaces to form elongated barbs;
• said method including the steps of:
• laterally inserting the fin upper edge into the slot along the length of the slot with the elongated fin ramp surfaces engaging a lower surface of the lamp support panel;
• and
• moving the light pipe mounting fin into the elongated slot so that the elongated barbs first compress inward against the elongated stem and then snap back outward after passing through the slot to retain the light pipe in an installed position with the fin stem disposed in the slot with the barbs spread-out over and above the slot and the light pipe suspended below the slot.

A method for installing a light pipe in a light fixture including the steps of:

• providing a lamp support panel having an elongated slot extending through a thickness of the lamp-support panel and extending longitudinally along a length of the lamp-support panel;
• providing an elongated light pipe including an elongated mounting fin comprising an elongated stem extending from along the light pipe, the mounting fin additionally comprising a first engagement surface disposed adjacent the stem;
• longitudinally inserting the fin stem into one end of the slot;
• and
• sliding the mounting fin longitudinally into an installed position where the fin stem is disposed within and along the length of the slot, the first engagement surface of the fin engages an upper surface of the light fixture and the light pipe is suspended below the lamp-support panel.

A method for installing a light pipe in a light fixture including the steps of:

• providing an elongated lamp-support panel having an elongated slot extending through a thickness of the lamp-support panel and extending longitudinally along a length of the lamp-support panel;
• providing an elongated light pipe having an elongated mounting fin comprising an elongated stem extending from along the light pipe, the mounting fin further including an elongated apex defining a fin upper edge and a pair of elongated ramp surfaces tapering outward and downward from along the apex to an outer edge of each of two fin engagement surfaces to form elongated barbs;
• laterally inserting the fin upper edge into the slot along the length of the slot with the elongated fin ramp surfaces engaging a lower surface of the lamp support panel;
• and
• moving the light pipe mounting fin into the elongated slot so that the elongated barbs first compress inward against the elongated stem and then snap back outward after passing through the slot to retain the light pipe in an installed position with the fin stem disposed in the slot with the barbs spread-out over and above the slot and the light pipe suspended below the slot.