Our 4 inch round Par 36 lights are available in strobe or halogen lighting technology and mount to almost any surface. These lights are great for tow truck warning lights, off road vehicle lighting and for use in fog lamps. Weatherproof design is suitable for exterior or interior use. The Extended style features a lens design that extends the lens for greater visibility at angles. Internal glass lens is protected by an outer Lexan lens and sealed beams offer maximum light output. Lights require external flasher or power supply to operate (a strobe power supply is required for the strobe models and a flasher is required for the halogen models).