Could anyone recommend a flash meter that would be suitable for evaluating fairly low levels of flash illumination somewhat precisely? I am interested in the range of 0.1-5 lux, with a precision of 0.1 lux. A flat-style (cosine) receptor would be needed. I don't mind if the meter can be used for other applications, but I am not looking to use it for anything other than this purpose. Inexpensive, even if older, would be a plus.

The main reason for using it would be to check the evenness of illumination while exposing sheet film, by contact, with Stouffer transmission tablets, illuminated by a flash head, as part of my mini-project in make-shift sensitometry. I was not sure if this is the right forum to post this query on, please feel free to move the thread if I erred.