What do LED photographic lights gr and CH mean?

PhotoGRaphic light gr is the focal length and CH is the distance.

The function of photographic lamp in digital camera is the same as that of flash lamp in digital camera. If you want to shoot dark objects, you must use these auxiliary light sources, otherwise the noise will be very large, and post-processing alone is not enough. For many novice digital cameras, the photographic lamp seems to be an unnecessary thing, and it is also the most easily overlooked digital camera accessory. This is also because there are too few photographic lights available in the market, and with photographic lights, it is not very convenient to carry a digital camera, which makes many users flinch.

Extended data:

In the process of shooting people, the use of camlight photography lamp and soft mask has a very good effect: the brightness is adjustable, the color rendering is good, and the details such as the eye light of the person can be outlined. Appropriate addition of auxiliary light sources can make better image effects of people and add new operational technical conditions for photography.

In film and television lighting and photographic lighting, the basic technical requirements are the same, but there are different requirements in specific occasions. For example, photographic lighting is a picture work, and its fineness is much higher than that required by TV shooting. Especially for point and line lighting, the use of modern lighting technology will greatly improve the shooting effect, but TV images have entered the era of high definition, so the requirements for lighting have also improved.