I use battery-powered push-LEDs such as these most often for backlighting but occasionally for lighting the subject as well. Each is about 2 1/2 inches across. They produce a blue tint and a somewhat diffused light.
If you’re curious, check out more of my Gear.
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This photo was posted to Flickr on 05 August 2010. The last time I checked, it had 4,013 views on Flickr.
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Push-LEDs by JD Hancock is licensed under a Creative Commons Attribution 3.0 Unported License. Permissions beyond the scope of this license may be available.