What is the most effectivemethodto control ir led strip
The infrared led with high efficiency of infrared radiation material (commonly used gallium arsenide) made of PN junction, the forward bias(the ir led strip 950nm as 3.0v) Injection current to the PN junction can stir up  Infrared light. the spectral power distribution for the center wavelength of 830 ~ 950nm. LED is the abbreviation of light emitting diode, the Performance feature is a positive temperature coefficient,the current ever more big , temperature ever more high. it’s easily get into a vicious cycle. And temperature ever more high, the current ever more big. LED infrared light power is related to infrared led current.but forward current over maximum ratings, infrared emission power performance suffers decreased.put it another way to explain(triadic relation),Emission current ever more small, the sensitivity ever more high ,Then transmit power ever morestrong.The radiation intensity of the infrared emission tube, depending on the distance from the optical axis and change,also varies with the light receiving element is different. The incident light is affected by the change of light components and infrared emitting tube distance.Basically light measurement is inversely proportional with the square of the distance(The distance of the control is proportional to the transmitted power),it’s a positive The different  character oflight device.when use the infrared to the control of controlled unit. the control distance move in proportional with Transmit power. In order to increase the control distance of infrared, infrared emission control working in pulsed mode,because the effective transmission distance of pulse light(PWM)and pulse peak current into positive ratio, just try to improve maximize peak (Ip)can increase the infrared transmitting distance. The method of improving peak(Ip) is to decrease the pulse duty cycle, put it another way to explain, the compressed pulse width （T）. Usually its use frequency in 300KHz or less.