The LTR390 is one of the few low-cost UV sensors available, and it's a pretty nice one! With both ambient light and UVA sensing with a peak spectral response between 300 and 350nm. You can use it for measuring how much sun you can get before needing to covering up.
Unlike the Si1145, this sensor will not give you UV Index readings. However, the Si1145 does UV Index approximations based on light level not true UV sensing. The LTR-390, in contrast, does have a real light sensor in the UV spectrum. It's also got a much much simpler I2C interface so you can run it on the Arduino or Python microcontrollers/microcomputers with ease.
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Adafruit LTR390 UV Light Sensor - STEMMA QT / Qwiic
This sensor is used for detecting the intensity of incident ultraviolet (UV) radiation. It is based on the sensor GUVA-S12D which has a wide spectral range of 240~370nm.
These 5mm bright UV / Purple LEDs give UV 'blacklight' light from the UVA spectrum. These are perfect for projects with fluorescent materials, also called blacklight reactive materials.