High UV Index value

[metanav]

High UV Index value

[levkovigor]

@metanav
Hello, today I've tested LTR390 and VEML6070 with good UV source with beam power density near 400mW/m2 (405nm).
LTR390 gives UVI 15.09
VEML6070 - UVI 16.20

According to research

for 400mW/m2 UVI = 400/25 = 16. So the data is correct for both sensors.

But it can be OK for UV source with narrow emission bandwidth. For sunlight with broad emission spectrum it can be incorrect and additional experiments should be carried out. To do this specialized equipment is needed.

Also it should be studied the sunlight power density at direct beam.

[metanav]

Thanks @levkovigor for the explanation. So it means LTR390 or similar sensors are not suitable to calculate UVI for direct sun light. I am using LTR390 for an indoor setup. Can I rely on the UVI readings in the indoor environment during daytime with bright but indirect sunlight exposure?