The mercury oxide batteries V625PX or PX13 contain the dangerous substance mercury and therefore may no longer be sold. What alternatives are there for this battery?
Plants perceive light differently than humans. We would like to give you a brief overview, which values are relevant to the assessment of horticulture lighting and how they can be measured.
Congratulations, you’ve taken a step in the right direction and purchased a precision meter that will help you to perfect the exposure of your shots and eliminate the need for a lot of waste and time to finish your images. If the light meter does not initially provide the values you expect, we recommend that you read this entry and perform the calibration described below.
The GOSSEN company has been producing a variety of exposure meters and light meters since 1933. For collectors, the English website www.myphotoweb.com by Ed van der Aa is a veritable treasure trove of the history of GOSSEN and information on the historic equipment.