Anyone know of a decent Lux meter download?

Anyone know of a decent lux meter thats downloadable. Also what should my lux be for my two little plants blue dream auto

Lux meters measure light that humans can see, PAR meters measure light that plants can utilize. There is overlap, but lux meters are weighted toward middle color spectrum and are not accurate measuring red and blue extremes.

With Quantum board lights you might get close with a lux meter, but with other lights not so much.

If you are iPhone user the “Photone” app has proven to be reliable with a paper diffuser over the camera lens.