If I understand your question correctly, it all comes down to pressure loss, flow, and distance. I'm not familiar with LDPE specifically, but have used PE. While the specific numbers might very a little between LDPE an PE the concept would stay the same. I'm also from the US, but will take a stab at the metric.
If you're using 15 mm PE the suggested max rate of flow is 0,252 l/s. Over 100 m there's 1,435 bar loss. If you're using 20 mm pipe, the max flow is 0,568 l/s with a loss of 1,320 bar per 100 m. The suggest max velocity is 1,5 m/s, and is what drives the max l/s.
For those in the US that a 1/2" PE pipe with a max flow of 4 gpm. Over 100 ft there's 6.35 psi loss. If you're using 3/4" pipe, the max flow is 8 gpm with a loss of 5.84 psi per 100 ft. The suggested max velocity is 5 ft/s.
I don't have the numbers in metric for a typical water hose, but I think you can extrapolate. If not, I can do the calculations at a later time.
To make everything the same, I'm assuming a max velocity of 5 ft/s. For a 1/2" hose (which I don't see very often), the max flow 3.1 gpm. Over 100 ft there's a 10.77 psi loss. I think a 5/8" hose is more common. For those, there's a max flow of 4.8 gpm, and a 9.36 psi loss over 100 ft. For a 3/4" hose (also very common here) you have a max flow of 7 gpm, and a loss 7.18 psi per 100 ft.
The basic take away is that PE (and very likely LDPE) has less pressure loss, and higher flows rates over the same distance than a typical garden hose. This may not be an issue for you, depending on how much water you need, and how much pressure loss you're willing to have.
The other thing to think about is perhaps LDPE isn't the correct material. I saw there was also a HDPE, but again I don't know anything about it. The PE I've used in the US comes in at least 2 thicknesses and seems to handle our typical city water pressure.
PVC (typically used in the US for in ground irrigation) comes is a variety of thickness, and sizes. Most of it isn't UV resistance, but the thicker sizes are actually remarkable strong (Sch 40 is what I typically use for all my irrigation). It'll hold up to some good wacks with a shovel when buried. The trade off for thicker walled pipe is increased pressure loss. It's probably too rigid for your application, but I wanted to throw that out also.