. They offer the same light out and functionality as your standard household bulbs at the energy-efficient standards required by the government. Eco Halogen bulbs are the perfect replacement for an incandescent PAR reflector, and can be used anywhere a standard reflector would normally be used.39 Watt Dimmable Flood EcoHalogen PAR30LN Medium (E26) Halogen Bulb, 6PK Eco halogen bulbs are 25% more efficient than standard incandescent equivalents with the same functionality (light output, disability, shape, color rendering).