Camera: Nikon D90
Exposure: 30
Aperture: f/25.0
Focal Length: 62 mm
ISO Speed: 200
Exposure Bias: 0 EV
Flash: No Flash
How I Did It
I used an old double pole cloth hanger (google it) in a dark room to hold a little LED construction I made. The LED construction consists of 5 small LEDs of different colors and a detachable battery pack with an on/off switch.
The lamp is hanging from the cloth hanger. On the ground I put a 1x1m mirror. In an angle of about 60 degrees I put my camera on a tripod, facing the mirror and focusing on the little LEDs reflection.
I switched off the light in the room, set my shutter speed to 30 seconds and put the LEDs in a circular motion. As soon as they were spinning evenly, I switched on the LEDs via the battery pack switch, let them rotate for a short while and switched the lights off again. 30 seconds are a long time, you will probably need about 10 seconds where the LEDs are actually turned on. You have to pay attention that you switch off the LEDs in about the same position where you switched them on so that there is almost no telling where there is the beginning or end in your picture.
It was really fun taking those pictures and it is an easy setup with the “wow-effect” many of us are looking for 
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