How to record runtime/output with a graph?

Can anyone recommend some easy ways to perform runtime and output graphs?

I know you can use a regular Lux meter and eyeball the reading every ‘x’ mins and jot it down in Excel to create a graph.

But I’m assuming there are some more modern and easier ways to do this also? Such as automatically tracking Lux over a duration and plotting it in an app.

This is a great one to start with:

https://budgetlightforum.com/t/-/45138

Zak's ceilingbounce app. Focused on runtime graphs. Maybe you could use it for output as well, but never done that, so I don't know how accurate that would be.

Here is a list of Luxmeters that do the logging for you as well.

https://budgetlightforum.com/t/-/56270

I’m using the app for all my runtimes on an old phone connected with a powerbank.
Afterwards i calculate Lumens with my Maukka light calibrated Lumen tube.

Thats fairly spot on, since the app gives percentual output as well.

See this, I made one, easy and not expensive

Thanks for the links. I’ve got the app installed and working on my Android phone.

Not fully setup yet, but enough to let me have a play and spot an issue with MF01 Mini.