277 Volt power to 120 VAC Light fixture

Discussion in 'The Projects Forum' started by rbolduc, Apr 21, 2009.

  1. rbolduc

    Thread Starter New Member

    Apr 21, 2009
    I renovated my elevator lobby in my condo.

    Its almost complete except for installation of the two light fixtures.

    The incoming power is 277 volt emergency power.

    I purchased the lights some time ago which are
    120VAC fixtures with 3, 35 watt incadecent spot lights.

    I need two physically small transformers to step down the power.
    The ceiling is concrete, the box is an octagon (3.5" diameter)
    Can't make it bigger.
    the fixture is 3/4" deep X 5" wide X 24" long so there is flat space inside the 3/4" deep cavity.

    Is there a small transformer available that can fit in the octagon box or the light fixture.

    Electronic maybe?
  2. Wendy


    Mar 24, 2008
    Perhaps putting the lights in series? Not a great solution, they would be rated for 240 in that configuration. You could be better results with long life industrial bulbs, which are rated for 130VAC. This would make a 260VAC configurations. Still not good, but better.
  3. tkng211

    Well-Known Member

    Jan 4, 2008
    Suggest connecting 2 spot lights in serious, then controlling the brightness ( the rms voltage) by a 240V dimmer. There are 6 spot lights in 2 fixtures, so you need to buy 3 Dimmers. By adjusting the rms voltage to a little smaller than 240Vac ( e.g. 220V) the life of the spot light will be much longer.
  4. KL7AJ

    Senior Member

    Nov 4, 2008
    There are ballasts specifically designed for this application. I'd check with an industrial electrical supply joint. (277 volt flourescent systems are used in just about all schools)