5000 Lumen 2x CREE XML U2 LED Cycling Bicycle Bike Light Lamp HeadLight Headlamp
I had purchased the 5000 Lumen 2x Cree XML U2 LED bike light via Amazon this week for $22. I used it last night for the first time. My impression? Fair at best. You get what you pay for. The light has 3 brightness settings: High, Med & Low. It puts out a good flood light with a width of about 30-40 ft. The length of light (ahead of the bike) is about 20 yds. It definitely doesn't put out 5000 lumens. I'm not even sure it puts out 2000 lumens. If I had to guess, I'd say it's more like 500 lumens..so they had a typo in their advertised output.
I fully charged the battery pack (4 x 18650 Lithium-ion batteries) before I connected it to the light. I have no idea what the capacity of the 4 batteries are. There was no paperwork. If I had to guess, I'd say each battery had only an 1100 mAh capacity. And, I'd say two of the batteries were connected in series and two in parallel from looking at the case. Since Li-ion batteries have a terminal voltage of 3.7v that makes for a 7.4v on-load voltage for the battery pack (2 batteries in series). The charging voltage of the battery pack is 8.4v and is advertised as such. Therefore, the battery pack is an 8.4v 2200 mAh battery pack. Why do I think the capacity was only 2200mAh? Because 3/4 of the way through my 1.5 hr. bike ride, the light shut down completely. It just shut off. And, that was on Med power. I knew there was no way the battery pack would last the entire 1.5 hr. bike ride on high power.
Anyway, I'm in search for a new battery pack for my new light. I'll probably end up paying more for the battery and charger then I did for the entire kit...but that's ok. I knew a 5000 lumen bike light for $22 was unrealistic. When I get a new battery hooked-up, I'll give yet another report/update.
Welcome to my Coaching Blog. I'm a USA Cycling Level 2 Power Based Coach. I was the first USA Cycling Power Based Cycling Coach in the State of Pennsylvania. To become a Power Based Coach you have to pass a pretty comprehensive exam by USA Cycling http://www.usacycling.org/ on the use of Power Meters for Cycling Coaching. I also think you must become a Level 2 Coach before you're able to take the exam. I've been training and coaching with Power for over 10 yrs. now.
Although I don't actively coach right now, I do give FREE advice to athletes looking to set up a training program for the first time or to seasoned athletes looking to 'break-through' to a higher level of racing/training. I've coached just about every type of athlete in the past, from young world class triathletes in their 20s, competitive cyclists in their 30s and 40s to older athletes in their 50s (like me) looking to just get back in shape. I've even coached older cyclists in their 60s looking to get stronger on their group rides with friends. So, feel free to email me any questions: firstname.lastname@example.org
Power ON! Coach Rob
Coach Rob- Triple ByPass Ride, Evergreen CO, Yes, that's snow in the mountains in July.