Here are some quick shots
Nice comparison! Very well done. A couple of questions for you. Which MJ880 clone do you have, the one from KD? Do you have the genuine MJ872 or the $30 clone? I always like the ability of the MJ872 clone to evenly light the near field. Is it the xml solarstorm or the xm-l2?
The dual emitter lights are clearly superior to the single emitter lights. It looks like the Yinding (Duo clone) has the best throw, but that could just be a function of how it's aimed (slightly higher?). They are all pretty similar really, but the Solarstorm has the brightest hot spot. It's tough to pick a favorite. I would probably go with the MJ880 clone or the Duo clone, because of the even beam in both near- and far-field.
I'm really impressed with the Duo clone. How are they pumping out this much light in such a small housing without overheating the light? Does it get hot, or is it a superior design?
The 872 is good if you want a really bright near-field, maybe for tricky root or rock sections. It obviously has bad throw. The three dual-emitter lights are probably a better buy for most people.
Based on the picture Modig posted, the triple xml is also a good bet. It's has a proven track record, and it appears to be somewhat brighter then the three major dual emitter lights (880 clone, Solarstorm X2, Gemini Duo clone). The triple can be had for pretty cheap now, I'm sure. There's also the option of buying these lights as light-heads-only. That's especially good if you already have decent battery from action led or xeccon. The Solarstorm and the KD 880 clone are both available that way.
It seems that we have reached a new standard for cheap lights and a new era of night riding. It's probably enough for most riders to ride at their day time speeds without too much worry. The doubles are definitely in and singles are out. These new lights really open up the world of night riding for everyone.
In my opinion, the better the cheap lights get, the harder it is to justify the $200 minimum for the "good" lights. I feel sorry for the guys who only buy their lights at the bike store. $100 buys you a 400 lumen light that last 1.5 hours. $100 sent to China buys you two complete sets of lights that are two to three times as bright and last for twice as long! If you read the bike magazine this entire segment of lights, i.e. Chinese imports, is virtually ignored. If it wasn't for this forum, I would have never known this stuff was out there. Thanks guys.
Happy night riding everyone!