The quality of infrared lamp depends on whether the lamp core chooses positive core or loose core, and the price between them is also very different, even more than five times different, which is also an important reason why the price of infrared lamp on the market is 36, 9 and so on.The camera is most sensitive to light with a spectrum of 850 nanometre, or red - burst infrared tubes, which are also the most expensive.Remove the lamp board of the infrared lamp and find an adjustable stable voltage source.In dark environment, first will be regulated power supply output voltage to the rated working voltage of infrared lamp, connect the lamp, the lamp to work properly, then gradually lower voltage to the lamp goes out, see a lamp light levels are consistent, if in the process all the lamp shining on lamp plate, then tubes with core;If some lights are brighter and others are darker, the quality of the wick is in doubt.There is another method - measurement.The working voltage of each lamp tube is measured when the infrared lamp is working normally.At present, most of the LED infrared lamps in the market use low-power lamp tubes, and the chips are mostly 12MIL or 14MIL[1 mil =0.0254 mm (mm)]. The normal operating voltage of each lamp tube is about 1.5v.With a digital multimeter, the range switch is set to 2V, and the working voltage of each lamp tube is measured. If it is a core tube, the error value of working voltage of each lamp tube is within 0.03V.This method is also suitable for 940 nanometre infrared lamps.
The advantage of positive core lamp tube is working stability,the lamp on working board looks again after 35years, they glow very consistent also. If the disrelish is low, adjust the working current to restore it to youth. Loose core lamp tube is different, after working half a year, some of the lights on the lamp board are bright and some of the lights are dark, a years is not out of trouble is lucky. Even if the broken pipe is replaced, it will still break down a short time, because the overall quality is poor.