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The use of extra lights, often flash units, in order to make up for a lack of light or to gain more creative control over the image.

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How much light do I need for handheld product photography in a lightbox

You may find useful this wikipedia page You can calculate the exposure value with the given formula: $$\begin{align} \mathrm{EV} &= \log_2{N^2\over t} \\ &= 2\log_2{N}-\log_2{t} \end{align}$$ where: …
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