I had now for several years, the Sigma lamp in use. Unfortunately, my illumination has never been so well-liked. The light angle was very low and so you could see late animals and objects on the roadside. In addition, the lamp has been quite expensive at that time and a replacement battery will cost today as much as this Cree LED with battery. The brightness of the Sigma could be a bit better. Then got me dochmal struggled through this Made in China LED to buy. At first I did not know which version I should test. 1-7x Cree information with utopian lumens. I chose with 5x Cree LEDs to get about halfway between brightness and battery life. These are, after all, the important criteria. I have first assembled both lamps in parallel to the handlebars and compared. For assembly: Because actually already came the first concern. Sigma: = screwed firmly, Cree XM-L: with rubber ring. I was afraid that on country roads and in the terrain begins to shake the lamp or even turns away, but the rubber ring is very tight and prevents (I've also taken the extra-tight rubber ring and levered with a screwdriver on the bracket). Both battery packs of bulbs are attached with Velcro on the frame. Here, the Sigma is slightly better. The velcro is glued directly on the battery. The Cree XM-L has a pocket in which the battery is located. Is unstable quite so, because the Velcro is centered not on the bag. I have now the battery mounted in the front corner of the frame. Has there with the best grip. Use: Both LEDs can be switched on via a rubber button. With fully charged battery (over 50% charge) illuminates the button of the Cree even easy to find in the dark. Even with gloves can be in both the buttons easily turn. The connection is made via a connector. The Cree has a cable (about 75cm) which is led out of the lamp and the battery has a cable (about 75cm). So you can place the plug at any point in the Sigma, the cable must be plugged directly into the lamp. Can find an advantage or disadvantage here with no LED. The Cree has three stages: light up full brightness, light low brightness, flashing and off. Unfortunately it is not possible from low brightness to switch back to full brightness. One has only to flash, make up and turn it back on. When driving through the forest already bad. So you have been going slow to bridge this second. The same problem also from Sigma (here the flashing mode, for 3 levels of brightness is missing). For Brightness: Cree's bomb. Although far from being achieved, the information, but much lighter as the Sigma Power LED. The low brightness corresponds to the maximum brightness of the Sigma. As written in a previous review 700 lumens low brightness, 1300 max. get there. Sigma had (800 lumens max.). Everything is super illuminated, angle about 30 ° -35 ° instead of 18 ° at Sigma. Headlight range depending on the orientation angle to 100m without any problems. The lamp is roughly comparable with a normal car headlights. In traffic, I use only the low setting and slightly downwards (5m-10m illuminated), everything else is Verkehrsgefährdung !! Even so the oncoming traffic when an obstacle is already available. At full brightness it recognized deer along the way at 200m distance. Since the brightness is sufficient even in the low mode, this is preferable. Saves battery power and the life of the LEDs. My two-way traffic will thank me. Battery Life: With the 7000mAh battery at full brightness 1: 45h, with low brightness 8 hours. Has been tested on the living room table, but also in the cold winter so far I could not find shorter maturities (bicycle and therefore the battery standing outside). I have had so far about 10 charging cycles. Even the battery is as fresh as at the beginning. The biggest criticism of the lamp is the battery indicator. According to the manufacturer (more than 50% = LED green, 10-50% in practice around 30%, red less than 10%). The red LED goes almost never, but the light goes out the same. Thus, it will almost always be surprised if it suddenly goes black. Yet there is no accident happens, I try even when the battery is low to this store before it is too late. Hab now also a spare battery, I mount the same as soon as the green LED turns off. For safety you should go with green LED always thus. Another point of criticism is the low power standby. Although the Cree is made, the green status indicator. Thus, even for a few days when the lamp is not used. Here shortening the battery life is noticeable. I have now got used to disconnect the plug. To charge: I have the charger yet not married, so I always invite on my floor tiles. Internally, the allerbilligste is installed. Only voltage conversion, no charging electronics. This is located in the LiIon batteries. Caution: When purchasing a replacement battery should be noted that, got two pieces with 8000mAh for 30 Euro. Same dimensions as this one. There are the battery packs of six cells with me. Conclusion: For the price top. I use the lamp now almost a year. The Sigma Power LED I sold. The criticisms can be avoided with early shop.
