I don't understand how to open it so that bulb can be replaced. It has no screws. Tried to move white dome anti-clockwise but does move at all.
Looks like ones I have that are springs/clips holding it. Does it turn when you turned it?
If so, you might just have to shift it over a bit, and pull down carefully.
ps. I'm trying to find an example with images of how they fasten online.
I have this light fixture. If you can see the lip of the fixture as it meets the ceiling, you will see 4 small wire clip edges sticking over the lip of the glass housing. Do NOT mess with these, I mention them as verification it's the same fixture.
The trick is simply to pull STRAIGHT down. There is a metal bar that will pull down too, that the bulbs could get caught on and crack, so be careful as you pull down. The fixture will NOT pull off, just pull slowly until fully extended.
I had quite a few bugs on the lip on the outside of the fixture; if you tilt it, debris can spill. Good luck!
Cheapest nastiest ceiling light I've ever come across.
If you are reading this you are likely good at DIY but needed validation that is was the pleb who designed the light who is the idiot and not a moment of madness (as we all have) due to the effort required, where most similar lights all unscrew. The reason it has a plastic cover is due to the fact when you need to lever it off using the one slot on the side, is that you have to do it so hard it ends up at the other end of the hallway! and the black base that was screwed into the ceiling is now hanging and has to be refitted. the new bulb will likely cost more than the unit itself, so may be worth investing in a new one ;)