i mean what was the idea to make this led work on 220V without adapter
I don't speak the language so I can't tell you.
Smart designers will usually build the device so that it's 99% complete, and a simple jumper, or swapping a single component will allow the device to be used on 220V or 110V. Without knowing what he is saying, I have no clue as to what he may be suggesting you do.
If the device is designed for that purpose, it can be done quite easily. If the device is not designed for this, then it will require a 'hack' of some sort to make it work. In either case, I still suggest you don't attempt it.
Look for a bulb rated for your local voltage, or a universal bulb that can operate from 100-240V.
Sorry, but I won't be sharing any further information on this. I've already had a close call from someone thinking they knew what they were doing with mains wiring.
I've seen dollar store extension cable installed in a wall where the insulation was dried and literally flaking off like dust. I've had an aunt get shocked when she touched the stove and fridge at the same time, and I've gotten not just a nasty zap from a shop dust collection unit that had no ground, but also had to deal with al electrical fire caused by using a plug that was not rated for the current the device was pulling. You know how you get that little spark sometimes when you plug something in? Well, apparently this spark never stopped and by the time I got to it half the plug was eroded or melted in the socket. (It sure 'looked' like the right plug, but you need to pay attention to fine print) Needless to say, I no longer work in this shop. Dealing with those problems is above my pay-grade.