Device for measuring optical density

Device for the qualitative and/or quantitative determination of

Device, method, and program for estimating light source

Diffuse optical transmission density measurement system

Digital display circuit for camera exposure meter

Digital exposure meter

Digital exposure meter

Digital exposure meter

Digital light measuring device

Direct ray solar meter and method

Distributed-switch Dicke radiometers

Door obstacle sensor

Dosimeter for assessing degree of illumination

Drive device for a light-emitting component

Dual detector laser beam power monitor

Dual mode camera exposure meters

Electric exposure meter

Electro-optical detector protection device

Electronic photometer with two variable indicators

Energy measurement system and method