Hybrid illumination for dark spots
HL stands for hybrid illumination, which Ajax added specifically for dark locations, with IR LEDs at the core of the illuminator. In black-and-white night mode, visibility reaches up to 50 m according to Ajax, further than the 35 m of the standard BulletCam in the same housing. An F1.6 aperture and a minimum illumination of 0.005 lux mean the camera can still produce an image in weak light without any extra lighting.