FR: Add irradiance equivalent as an output option

[wigster]

Rather than for light levels, I am using the irradiance sensors to estimate how much heat my windows are getting from the Sun and whether it is worth it to close the blinds.

The conversion factor from lx to W/m2 for the Sun is around 120 lx/(W/m2), so it's just a constant value for the relevant range of Solar illuminances. Here is a reference:

https://www.extrica.com/article/21667

Could you add irradiance as an output option to your integration?

[pnbruckner]

Sure, that seems reasonable. I'll add this to my to-do list.