Our large-diameter ring light can be mounted at a distance of approximately 30 to 40 cm to illuminate an A4-sized area relatively evenly.
However, this is the practical limit for this level of illumination.
To evenly illuminate areas larger than A4 size, a large lighting system, such as the one shown below, may be necessary.
The following is equipment from LPL (photography equipment manufacturer).
Another method is to attach a surface-emitting light as shown below.
For a simpler solution, you can arrange a desk light-style fluorescent lamp as shown above to achieve broad-area illumination.
(Fluorescent lamps diffuse light more than LEDs, having lower directivity.)
