Amazing retina searing 1700 lumens! While this is an older model, it still packs a wallop. The actual light portion of the Seca 1700 is light and while mounted on a helmet it is barely noticeable. The only time I noticed the weight of the light it was riding downhill when my helmet would tip slightly (even then is was quite minor). That was easily resolved by tightening the retention system on the back a click or two (will vary depending on your helmet). The Enduro battery is light and can easily be stowed in a jersey pocket.
I would recommend an extra velcro strap or any other type of easy to remove fastener for the battery cord. While routing the cable from the light to the battery, the cord moves around a bit and would tap my ear from time to time. At first it freaked me out because I thought some blood sucking insect or animal was trying to get into my ear but luckily it was just the cord flapping in the wind.
The battery is small and light enough to have in a jersey pocket and pretty much disappears in a hydration pack. The battery can also be strapped to your frame with the included velcro strap. There are slots on the battery body the strap can thread through and secure the battery to your frame.
The light has a bar mount built into it and a helmet mount is included. The helmet mount uses a velcro strap that you weave through your helmet vents to secure. The Seca light then uses the built in bar mount to strap to the helmet mount. When putting the mount on your helmet, it can be a little frustrating, depending on the location of the vents on your helmetÃ¢ÂÂ¦before your first time riding with the Seca, it would be easier to test your setup well before your ride so you will not be stuck in the dark finagling with the strap.
The one thing I feel could be improved would be the on/off button on the light. It is sleek and looks nice but difficult to feel the button with full finger (not insulated) mountain bike gloves on. A slight indentation or other affordance would be nice.
The light has three different levels of beams and also a blinking mode. It can also be put into race mode if you hold the button down for two seconds (when the light is offÃ¢ÂÂ¦.not when it is on). Race mode allows you to switch between the high beam and low beam setting and omitting the medium beam and blink modes. I prefer the race mode since when climbing I use the lowest beam setting and high for the descents. It would be nice if it had an option to stay in race mode instead of having to do the button hold every time you powered the light on.
If you are looking for a super bright light to ride with check out the Seca 1700 or one of the newer Seca 2000.