PRODUCT

Lux (illumination) is that the camera can capture images in low-light environments. We called the Lux minimum illumination to show the details of the camera. This means that the light at the camera. It can capture images as 0.8 Lux (Colour) means this camera can capture color images on light or more if the lighting is less than 0.8 Lux 0.8 Lux is black and white. And do not capture the dark is 0 Lux (but do not tell them to be constant for all cameras anyway) unless the camera is an infrared camera. Therefore, the dual-circuit There is a camera with TV Line high level then often look for a camera with a low Lux.

TVL or TV LINE 

TV Line is the clarity of the camera. The higher the value, the more pictures will be sharper details like camera resolution 520 line images that are sharper than cameras with resolution 420 lines or cameras with high resolution and the price will be high. according to

Resolution, on a pixel.
420 TVL = 270,000 pixels.
480 TVL = 380,000 pixels.
520 TVL = 430,000 pixels.
550 TVL = 480,000 pixels.