Be very careful any regular lifting session can turn into a fatal one. Asking if you need a spot is almost a loaded question right? A sign of weakness. A sign you might not be able to handle this weight. Actually, that couldn’t be further from the truth. Not having a spotter is a sign you might not be able to handle this weight, at least to your brain.
Use spotters even at lower weights. When your brain is not as worried about basic safety, it can focus on good movement and lifting weights in a powerful manner.
Be wise, know your limits and lift carefully!