I have both, the Sunburst Saturn and the Magnum lighted collars. The Sunburst are rechargable and last 18 hours on full charge. My Magnum lighted collars are disposable and last around 2000-3000 hours. Between the two they are both around the same brightness but the Sunburst LEDs are high up on the collar and the Magnum LEDs are mounted on the bottem of the collar, making the Sunburst more vissable. They both are nice and pretty well designed but I would recomend the Magnum over the Sunburst for the simple reason they are water proof and the Sunburst collars are not. JMO
P.S I ordered my Sunburst from WICK and my Magnum collars from the Magnum website,
www.magnumtelemetry.com