not joking .... this light is bright. I only use it on the low setting, and even on low, it's bright. I have had it for a while, and commute on very dark back roads 5 times a week. So far so good (for the £16 that I paid) ... if it packs up, I will buy another of these
6200LM 3x CREE T6 LED Bicycle Bike Light Headlight Flashlight+Battery+Charger UK | eBay
Dimensions: 49mm: L: ×74mm: W: × 41mm(H)
Weight: 130 g (Without battery pack)
LED: 3×CREE XM-L T6 extra white LED
Output 3 x XM-L T6 white LED bright can come to 6600 lumens
Battery: 4×18650 battery pack
Circuit: Digital CC circuit, power indicator system, Low-voltage alarming system.
4 Mode: Low-Mid-High, hidden Strobe
Dimming: Electronic pushbutton switch
Lumens: 6600Lums
Runtime: (8400mah) 1h40min -2h40min
Material: Aluminum alloy
Lens: Impact-resistant optical lens with AR coating
Reflector: Metal reflector
Waterproof: IPX-7, unable to support dive use.
Head & Tail: Aluminum alloy bezel ring
Mark: LED and mode are optional on your preference.
Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent.
Waterproofing design.
Aluminum alloy structure with wear-resistant anodized finish, deep heat sink finish.
High-performance electronic switch
Slightly click the switch to turn ON/Off the light.
Slightly click the switch to change the brightness modes, Low-Mid-high.
Long-press the switch for more than one second to access strobe mode.
Power indicator system:
Power > 80%.. three indicating LED on.
50%< Power < 80% , two indicating LED on.
100v-240v Battery Charger. ( LED indication for Power On / Charging / Full charge )
Model of Battery required: 1 x 8.4v 8400mAh Battery Pack
Package Content:
1 x Bicycle Light Black color
2 x Spare O-ring
1 x 8400mah Battery Pack
1 x Charger (EU plug), UK plug adaptor will be sent for free
1 x HeadBand as showed in picture
Remark:Please kindly do the battery charge for 3-5 hours at first time use. The power of battery may auto eliminated after long time delivered.Please do not run the strong mode for the whole time, the light overheat may eliminate the lifespan of light.
Looking at the
Cree XML datasheet, I think you'd be very lucky to be getting 1800 lumens out of the LEDs at full bright not including losses in the lens and reflector (substantially less) or less than ideal performance by the LEDs due to electronics (if there even are any). The only way they get to 6200 lumens is by driving the LED way out of spec.
Also,
there have been warnings about the battery packs that Solarstorm has used on some of their lights. So you might want to take precautions when charging the battery.
This from your description above is telling:
Please do not run the strong mode for the whole time, the light overheat may eliminate the lifespan of light.
That tells me that almost certainly there is no thermal control of the light. Run this thing too hot and it's going to burn out - or worse - run it on bright for any length of time and it's going to burn out. You can run it too hot running by running it on full bright or if you were using it in other modes and it was hot out and you were not moving (airflow). This thing is probably just direct connected to the battery. All of these things are bad (awful) for reliability.
Pretty classic Chinese light spec game playing and reliability issues. As always, you get what you pay for. In this case, they have taken out any thermal management, use cut rate (maybe factory reject) Li-ion cells in non-protected packs and charge them with a cut rate charger that may not have any protection whatsoever. All of those things would take cost out of the device and reduce the long and short term reliability and safety.
J.