stephenk
(stephenk)
9
The answer to your question is in the linked article 
Light painting is the intentional addition of light during a long exposure photo. There are two main genres of light painting 1) light drawing/creating light trails, 2) illuminating things.
For (1) creating light trails - there are many light painting systems (Light Painting Brushes being the most well known) which allow a range of flashlights to be connected to a range of different light painting tools (e.g. tubes, fiber optic cables, fiber optic brushes, light blades) via an adapter, which can then be used to create light trails. Lights with a “general purpose” beam profile are optimal for this. This allows for huge flexibility in creativity. Whilst there are plenty of non-flashlight options as well such as LED tubes, calligraphy lights, light pens, etc they are all very specialised and specific to a task. Non-flashlight options for creating light trails are covered in one of my other articles.
(2) Illuminating things - the best tool for job will depend on beam profile, and whether the illumination is static or moving. For near field use, LED panels, cube lights, and flashlights with diffusers work well. The latter option is better if the light source is in the photo. These are all covered in the article. For high brightness requirements, medium, or long range range illumination flashlights are the best choice as battery powered LED panel lights are not bright enough in terms of lumens or lux/cd. Some light painters might use a battery powered flash unit during a long exposure to light things up, sometimes using multiple pops of lights.
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