Angle problem of IR LED
Bigger perspective of Infrared light is better, isn’t?Whether manufacturers or contractors assume agree, they think the infrared lamp Emission angle is bigger, the selection of lens room is bigger, the choice of the wide-angle lens does not appear “flashlight” phenomenon. So, everyone that their perspective is How great the infrared lamp. This seems to make sense ,but actually the inaccurate. First of all, the use of large angle of the infrared light with small angle shot,
First of all, the use of large angle of the infrared light with small angle shot, the use of light exist waste phenomenon.For example, an infrared lamp, hair Light angle is 80 degrees (equivalent f3.5mm camera angle), when combined with a f35mm lens, then there will be a considerable part of the light is in the lens The visual field, that is part of the infrared light is wasted. In general,
They is consistent between the view to infrared light and the camera’s perspective，in this way
effect Is the best. For example，Ledlightmake’s infrared lamp and emission angle of the lamp is used to represent the focal length of the lens. The HK-4.2W-16 infrared lamp, The implication is that: “-4.2W” means the lamp rated power is 4.2 watts; “-16″ means the launch angle of the lamp and the lens of f16mm angle is Consistent, both can be matched. Classification of the infrared lamp according to the angle, in currently including “-4″, “-8″, “-16″, “-35″ four series, were a nice match for the commonly Lens on the market。used the bigger angle of infrared light to great effect in the imaging services.so The bigger angle of ir LED not draw the effect is better. Other case，Such as corridors, because of its “narrow” features, if the angle of infrared light emission is too large, then the edge of imaging will be too bright and make The formation of “screen” phenomenon。away from the center but can not see, only a piece of white phenomenon. So, the corridor should be lens angle infrared lamp 1/2 or 1/3.