It is well known that the sterilization effect of deep UV LED is affected by the efficiency of UV LED, UV dose e (UJ / cm)²）=Average optical power (UW / cm²）X time (s), the conversion formula between average optical power density and optical power is

Calculation formula of surface average optical power density

It can be seen from the formula that the luminous angle is inversely proportional to the average optical power density of the object surface. The larger the luminous angle is, the lower the average optical power density of the object surface is. We use TracePro to simulate the luminous flux distribution of l280-qsc1f30a700 and l280-qsc1f30a700-120 ° at 6cm, as shown in the following figure:

Light field distribution of l280-qsc1f30a700 and l280-qsc1f30a700-120

At the same time, two kinds of light angles are compared by using ata-led626 led distribution photometer. See the product specification of DUVTek for details. It should be noted that in different application environments, we need to calculate the uvc-led irradiation range at different distances, and then design the optical angle.