The Bower SFD-RL71 Large Digital LED Ring Light is a ring light that has 16 LED lights to provide constant illumination for even, shadow-free lighting. It will work with any system, film or digital, with filter diameters from 67mm to 82mm. This is especially ideal for medical, dental, industrial and creative applications where the situation demands close-up, detailed, well-lit images.
The large model ring light appears to share its electronics with the smaller version; however, the ac-dc-off switch on the larger light has a much more solid feel and the charging circuit has proved very reliable. The effective throw of this light is under 10 inches, so take this working distance into account when adding this accessory to your kit.
Coupled with my f/2.8 Canon, this LED based Light Ring allows me to capture macros without the harsh light that ring flash units can produce. It is not a replacement for a proper ring flash, it is a tool to use when the ring flash is too much. Although the power cord can get in the way, it is convenient so that I am not burning through batteries.