|CUL04 Indoor Infrared LED Illluminator|
Most ACTI cameras have filters that allow them to pick up infra red, however most do not have their own built in IR lights and so would rely on something such as a CUL04 to provide IR to see in the dark.
The CAK-5211E is one of the few ACTI cameras that has its own built in IR lights, so it does not need a CUL04/10 to see at night. This is shown in the left image, where only the IR built in to the 5211E camera is used. The right image shows what happens when you use the 5211E built in IR emitters as well as the CUL04 IR unit. You can see from the side-by-side comparison that using the CUL04 results in a brighter image; this shows that the CUL04 IR light is more powerful than the built-in IR lights of the 5211E camera.