Hi guys.
Just got my first luxmeter a couple of weeks ago. Nice and cheap 
I reviewed the DM21 recently, and found myself wanting to do runtime tests but unable to do so.
What methodology and equipment do those of you who perform runtime tests use?
Tried to search the forum about it and found out that some meters have logging capabilities.
Other than that Iām non the wiser.
Any quick technical input?
MN