No tech specs feedback!

I purchased 2 headlamps online and it never performed as expected. It looked exactly like the product of another company, but without any technical specs to compare. Within 3 months the operating time was down to almost half...I eventually found my invoice - the website has no customer care / contact details - and voiced my being unhappy with a 60- 90 minute operating time. I promptly received an email back from a hannesdevry@yahoo.co.uk confirming the operating time was correct, even though I noted in my email the initial operating time was 2 hours. I then asked for the technical specs of the item(as every other lamp states when advertised by others). I specified exactly what specs. Needless to say I did not receive any feedback. The one lamp I gave as a gift to a technician family member and his feedback is same. With the specs at hand I can compare it to the other and same lamp on the market and make an informed decision: the lamps I bought are faulty or expected as specs are lower. ..