There are so many different wavelengths of Infrared led included 880nm, 940nm, 850nm, However, this time, select only the 940nm matching Receiving head.

There are two main reasons for this:One of the main reasons for the ir led in prices  Price of ir led 940nm is cheap, In this sense, price competition is the main manner. among them, the 850 most expensive, 880 times, 940 of the most expensive.

On the other hand,Let’s look at general insights that can be drawn from analyzing these profiles（transmitting power）.as before 850nm was the most powerful,840nm is number two,940nm in weakest.Some people deem that To increase the distance of the infrared transmitted  which should be considered 850nm, if only from the perspective of the transmitter, it is the right, But, however, ONE thing must be considered the receiver, Another thing is that Transmission distance and power are positively. Through the above analysis, and finally have a renewed understanding on the ir led strip.