If I'm not wrong, spot lights comes with the attenuation parameters set as Constant by default, which means that the light never decreases, pretty much like the Sun's at our level, not really correct for a spot.
That's something you'll have to change on the light's properties window, on the second tab:

Inverse Square is is more real-life like
Don't forget also to play with the start and end angles, to give an effect like a flashlight. Start angle not nul but less than the end angle gives a blurred border.

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️