I have made a Samsung 3 chip led module and its say 12VDC. How a 12vdc is measured in blender. What setting i can provide to get the accuracy of 12vdc light output.
The Voltage the light is operating on doesn't tell much as the power also depends on the current flowing through and the light emitted on the efficiency of the light.
Luckily we get enough information from the datasheet of the light. Its light output is 110 lumens. That is illuminance, not irradiance that Cycles is based on, so we need to convert:
To convert, we need to know the spectral composition of light it produces, because the conversion is dependent on the wavelength. Looking up the LM561B 5630 LED datasheet, we can get the chart for the 6500K LEDs your modul houses:
The luminosity function looks like this:
The peak is 555nm green where 1W produces 683 lumens.
Now you have everything for nice mathematical integration exercise, if you want to be precise.
But honestly, IMHO, I doubt Cycles is even slightly this scientifically accurate. In manual the emission strength is supposed to be Irradiance, but Cycles does not deal with non-visible wavelengths, it is not even a spectral renderer, and it's white-point is sRGB white which is 6500K, which does not correspond to real-life black-body white.
Even for the luminosity function there are multiple CIE standards.
Your best option is not to be accurate, plug the LEDs power rating of 1.32 Watts per module, and slightly lower that because some of that goes to heat. Lastly tweak it so it looks good.
If you need to be visually accurate, you need the light's IES profile to use with render engines:
And if you need to be scientifically accurate, you shouldn't be using Cycles.