Just because a lighting manufacturer such as Philips (for example) say to use a leading edge or trailing edge dimmer switch doesn’t mean it will work. You need to know specifically which one to use as they are all different, a leading edge dimmer switch from one company will give you totally different results from a leading edge dimmer switch from another company.
Even using the same dimmer switch from the same company with the same product code can give different results with the same type and amount of LEDs. You also need to make sure the batch codes are the same or flickering may occur.
Like more hotel used LUTRON Dimmer, but Triac dimmer also is common, so that’s request when you buy dimmable led lamps from supplier, need to told them which you need.