The light is emitted at an angle of about 60 degrees and has a range of (in my camera) about 4-5 meters. To me, that is quite enough, at extreme wide angles dark areas can creep around the edges but if necessary. One notices mE but only at high contrasts.
The light is very bright and even when using the lens and / or the warm light filter still comes to sufficient light. Larger rooms can thus not illuminate, but it is certainly not intended. This is of course dependent on the camera's sensitivity and therefore to assess completely subjective.
The brightness can be very easily adjusted in a wide range via the dimmer. Really easy. About the rotary control can be even after shooting breaks easily back the original brightness settings Select.
It has a very white light, which can be "warmer" also features a Tungsten filter but.
The magnetic holder for the filter disks is very smart. You can change the discs ultra fast and everything is tight and nothing rattles or wobbles.
Overall, the light makes a very high-quality impression, but a long-term or long-term test, I could not perform. For me a good companion for light ...
Addendum dated 13.03.2013: Unfortunately I had to return the lamp: it was very hot during a long period of use of about 10 minutes, then she started to flash as soon as they ceased with the dimmer to about 80-100% of their power , According support but this is due to weak batteries or rechargeable batteries. I'll try this again ... now!
Addendum of 22/03/2013: Have the lamp can test with Eneloop batteries. The malfunction described above (the flashing light after about 10 minutes) has not occurred. So it was actually on the batteries. Did a test with a burn time performed 60 minutes thereafter were the above. Batteries will discharge only about 50%. The heat development described above is also due to batteries and has not occurred in the battery. So overall a very successful test. Both very good and fast support by the seller at answering the questions or the Service if, as well as a very good device.