I'm trying to design an LED light, but I'm not sure how many LED's I need for a given light level. Specifically, the Luxeon LXR7-RW57 1000 lumen white LED (data sheet) Q: How many lux should I see ...
What is a light meter? How do I use one? What sort of photography will fool a digital camera's meter? Hence for those you do need to meter.
The more I read about this, the more confused I become. Illuminance, as I understand it, measured in lux, is the perceived brightness of light on a surface. It's what you'd measure with an incident ...
Many times I shot photos, but the photo is some times too bright or too dark and the colors are incorrect. Some times the white on the photo is not the white that I have on background but gray and I ...