Question for optics oriented pro´s

I recently bought binoculars, I have a feeling that they are not complete tossers even though chinese. Not even too expensive.

I keep hearing people say : “With good ones you can see in Low light conditions, bad ones will get blurry…”.

My Luxmeter measures now outside at about 5-6lux (time:0030, fully overcast, no rain or fog).
What is considered to be a “low light” situation and I don´t mean night time or moonlight (0,26Lux).

In this 5-6Lux light it is possible to see still with these binocs clear enough. Not much difference in light amount to eye in view with or without binocs.

What I CAN understand, is that obviously the coating of optics may play a role in result, after all, there are plenty of glass surfaces inside…
Maybe glass quality also.
Outer lens size also? How much light it gathers?

These are 10x40 “Baigish” BTW but I have no special intention to use them when dark/low light, just trying to get some reference how these are made. :beer: