We can not claim higher luminous efficiency than a sodium lamp or higher PAR (Photo synthetically Active Radiation) than a metal halide or sodium lamp because when we measure our plasma lamp in lumens or micro moles it nearly always measures at least 30% less than other HID lamps of the same wattage. We will claim a higher PUR (Photo synthetically Useful Radiation) value because we believe the plasma lamps that we manufacture are the only lamps that are truly a full and continuous spectrum and thus, completely unlike LED's, deliver all of the light that is useful for photosynthesis.