hi again, these guys should be thankfull that you were nice enough to post all these nice pictures and even a side by side of both lights. there is a chance that the power chip could be bad or a bad connection some where do a amp check with a meter and put the same batt in the r2 light. amps should be between 900ma and 1.6 amps. if the r5 is way less than some thing is wrong.
dont wast your time talking with these guys, they just want to argue, and now it led lingo. i say if the person is interested in a light were spending our limited time talking about, they can look it up on the web or manufacture.
if you dont know how to do a amp check tell me and i will be glad to explain in detail. we will get this light working good if you want me to help you. cheers, randy.