To be thorough, the amount of UV produced relative to sunlight is (usually) quite small. Negligible might be a better term.
Also, keeping in mind, some fixtures do include LEDs specifically targeting the UV band (usually UVA, sometimes UVB) which can approach similar levels of exposure as to sunlight.
Looking closer:
Sunlight
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287-320nm UVB : 0.06%
320-399nm UVA : 3.06%
Integral radiant (350-840nm): 483.8 W/m^2
Shaded Sunlight
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287-320nm UVB : 0.20%
320-399nm UVA : 7.39%
Integral radiant (350-840nm): 60 W/m^2
LED Heliospectra 601C
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287-320nm UVB : 0.01%
320-399nm UVA : 0.12%
Integral radiant (350-840nm): 177.6 W/m^2
Fluence RAY44 UVSpec
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287-320nm UVB : 0.02%
320-399nm UVA : 19.07%
Integral radiant (350-840nm): 34.1 W/m^2
So from these, we can make a general estimate as to the power in the UV band for the listed lamps (note: this is not the correct way to calculate this but it works as an estimation):
Sunlight: ~15W/m^2
Shaded sunlight: ~4.5W/m^2
LED 601C: ~0.23W/m^2
LED Fluence UV: ~6.5W/m^2
For the single LEDs fixtures shown, relative to sunlight, the amounts of UV are small except for the LED fixture that include LEDs that specifically targets UV. As the number / power of the fixtures increase, there would be a corresponding increase in the UV band power.
More spectral information, here:
Lighting Spectral Data Growroom Design & Setup
Heliospectra 601C & 601G
Measurement device: Stellarnet CXR-SR-100 w/ CR2 Cosine Adapter. All measurements are single point, 18 inches from the center of the light source.
Definitions: PAR - photosynthetically active radiation. Integral power across 400-700nm. YPF - yield photon flux. Weighted photosynthetic yield measurement across 360 to 760nm. YPF/PPF - the ratio between the PAR and YPF calculations. This metric exposes how closely the overall light output in the PAR region targets the tra…
