Energizer S5163 ECO 400W Linear Dimmable Halogen Light Pack of 2 500 watt linear halogen floodlight bulb uses 400 watts of energy. Card 2 Eveready Low energy Linear bulbs are an environmentally friendly version of every day popular bulbs. All Eveready low energy ECO halogen bulbs use UV stop glass this reduces the bleaching effects of Ultra Violet radiation on materials and also reduces exposure of the skin to UV rays. Features: Clear, crisp, pure white light Beam control Longer life compared against incandescent lamps Great for decorative/display lighting UV Stop Protection Dimmable.