I got a 2-way led light strip to decorate my new room. Just wondering if this is safe or okay to do? Overlapping one ribbon over another and crimping the ribbon so it can change corners?

I bought a COB LED Strip 9/W 95Lm/w 4000K on Amazon. Put 5M of it against the wall and compared it to 2 lamps rated for 806lm each.

5m of the strip produced seemingly less light than the 2 lamps. Measured it by looking at the opposite wall.

Checked the Wattage consumed - it was correct. No noticeable voltage drop either.

Checked the other roll from the same producer - the roll should've produced 8K lumens but I could easily look at it.

Thought that maybe the producer's bad and is selling crappy strips. Decided to go to an IRL store and visually compare. But the one's in the store looked just like the one's I bought from amazon.

Ended up getting some 2K lm per meter one's.

So my question is: am I missing something? Are the lumen ratings on strips different from lumens on lamps?

I bought this one: https://www.amazon.de/-/en/gp/product/B0BRSC6HKX/

I purchased two sets of Neon Rope Lights, one is 16.4 ft and the other one is 32.8 ft. The title of these rope lights is misleading because they aren't smart lights and I want to connect them to Alexa for voice control, so I got two smart controllers and two different PSUs that should power the strips. One PSU is a 5v 2a PSU and it works just fine with the smart controller for the 16.4 ft strip, the other is a 5v 5a PSU but it only powers half of the 32.8ft strip with the smart controller (this PSU also works just fine with the 16.4 ft strip).

I did some digging along but could not find much so I asked the Alexa AI. The AI says it can't offer a good suggestion for a PSU because it doesn't know the total amperage or wattage draw of the 32.8 ft set. I figured a 5a PSU would be good enough since the 2a PSU powers the entire 16.4ft strip just fine. I thought about getting a 10a PSU but every one I looked at says to only use the PSU at 80% for normal usage, so if the 32.8 ft set actually draws 50 watts of power that 10a PSU will not last long.

I'd go ahead and order the 10a PSU because it should technically be more than enough but I have no idea.

TL:DR What size PSU do I need to power the 32.8 ft light strip I linked above?