One of the reason is the installed light connection don't support much load
This is false.
There are two reasons why a light fixture or its connection can't support enough load.
Firstly, it may have limited current. It's perfectly feasible for the wiring to only support let's say 2.5 amperes. Lights use very low current and therefore thin wires can be used. But 2.5 amperes at 230 volts is already 575 watts. 575 watts of LED lights will make your room very bright with light. I cannot imagine a situation where the wiring could support only less than 2.5 amperes, since the wiring would need to be microscopically thin then. Besides, more common are 10 ampere circuits. 2.5 amperes would be an extraordinary case.
Secondly, the light fixture can have limited heat dissipation. Remember that most lights, yes including even LED lights, mainly create heat and light is only a side product. LEDs are more efficient than CFLs which are more efficient than halogen bulbs which are more efficient than incandescent bulbs. But all of them, including LEDs, create primarily heat. Only an insignificant fraction of the energy goes to light. However, in times when incandescents were the standard bulbs it was very hard to find a light fixture that can't have at least let's say 40 watt bulb. Usually 60 watt bulbs are most common. 40 or 60 watts of LEDs in a bulb will make a very bright bulb. In fact, so bright you can't find one. Usually 17 - 20 watts is already very exceptionally bright.
It is theoretically possible that today some manufacturer could label some light fixture to accept only let's say 14 watts. Most likely this is overly cautious: I cannot imagine a light fixture where one cannot safely mount a 20 watt LED bulb, after all it only creates about half of the heat of a 40 watt incandescent bulb.
I also like lots of light. My solution has been this: I always buy only light fixtures that can accept three light bulbs. They may be getting more difficult to find in this day and age of LED lights, but not impossible to find. Then at each light bulb socket, I mount the brightest LED bulb I can find, usually those make around 2500 lumens each. So 7500 lumens per light fixture.
This doesn't help if your light fixtures are permanently mounted and you live in a rental apartment. But it does help if you can mount your own light fixtures.
Note that 2500 lumens per bulb and 7500 lumens per fixture is very bright. In fact, so bright that you should use light fixtures that have a glass that makes the light more diffuse. If the light fixture has the bulb directly exposed or behind fully transparent glass, the bulbs are so bright they make your eyes hurt when looking at them.