Innovative Cooling System. In 1989, Pace extended the limits and capabilities of the underwater lighting industry when we invented an innovative cooling method that allows HMI fixtures to work in diverse and extreme environments. By controlling temperature using heat sink fins and a Teflon barrier, the fixture’s electronics and seals are able to withstand a 400° F temperature differential. This breakthrough makes it possible for the PacePAR™ 1200 to go from dry to wet environments in many set conditions. An added benefit of the design is that, protected from excessive temperatures, the fixture’s electronics and seals last longer.