How long is one hour of UV aging test chamber equivalent to natural outdoor light exposure

How long is one hour of UV aging test chamber equivalent to natural outdoor light exposure ？The UV accelerated aging test chamber can simulate the damage caused by UV sunlight, rainwater, and dew. Within a few days or weeks, the UV test chamber can reproduce the damage caused by outdoor exposure for months or years. Thus achieving the effect of simulating UV outdoor aging.

Customers often ask this question, and to be precise, it is impossible to estimate.

Because outdoor lighting is not only related to seasons and regions, but also closely related to temperature. Different places have different altitudes, different seasons, and different lighting conditions. So we can only make a rough estimate.

Taking southern Guangdong as an example, the value is 1500KWh/m2 per year, and then divided by 8760 hours per year, resulting in 171Wh/m2 (i.e. annual average hourly solar radiation)

The total radiation intensity is 1120W/m2, and at 340nm, the measured irradiance value is 0.68.

Now, we can calculate that at a set value of 0.68W/m2 at 340nm, it is equivalent to 6.55 times the outdoor irradiance. However, UV aging is closely related to temperature.

The annual average temperature in Guangzhou is 21.8 degrees. When the temperature doubles, empirical evaluation shows that the aging effect is enhanced by about 1.5 times. Therefore, when the set temperature is 60 degrees, there are 27 days of 60/21.8 * 1.5 * 6.55.

That is, conducting a one-day UV test is equivalent to the aging effect of 27 days outdoors. (60 degrees, 0.68W/m2 at 340mn).

Kezheng Instrument is a professional manufacturer of UV weather resistant test chambers, xenon lamp weather resistant chambers, high and low temperature alternating humidity test chambers, and other equipment.

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