Ir led strip attenuation Does the cause that cause have those?

The is infrared radiation proportional to the light radiation power .the change of the size of signal output by light radiation power as direct。this could lead to ir led strip output changes. In other words, The infrared radiation would be affected, but very slightly.There are several reasons for Ir led strip attenuation。

(1)The light source is gradually getting Ageing，light radiation power is declined and output signal got it low 。
(2) The resistance value of light source is correct or not.
(3) The input power plug.’ Oxidation can cause contact problems.