Cheers for the link. I've researched far eastern sources in detail. The problem is misinformation. Direct from factory they can give you raw data (I can't afford to buy and ship in bulk), but any level of reseller (aliexpress/hongkong ebay) gives useless or patchy info, often contradicting their own figures or visibly copy-pasting from somewhere else. Western resellers are no better. :P

The ebay link says 240w, but idk what they're calling "max power". If that's max efficiency then it's pretty good.