700 to 1000 μg. Full out-of-body experiences. Synesthesia more likely. Religious imagery often strong. Entire loss of rationality, lack of ability to walk or interact in any meaningful way.
1500 μgs+ Experiences may be similar to DMT but extended. Basic body functions are challenging. Vision is consumed by hallucinations. No sense of self remains. Audio hallucinations may be strong. Standard reality no longer applies. Merging with objects likely. No type of rational thought left.
A deadly dose is around 800x higher than that. You wouldn’t be as high as a kite. You’d be as high as Voyager one.
16.5 mg is 16500 μg. So a 70kg person would need over 1 million μg.
According to https://www.trippingly.net/lsd/the-lsd-dosage-guide, 25 μg is where visual effects start.
A deadly dose is around 800x higher than that. You wouldn’t be as high as a kite. You’d be as high as Voyager one.
The data about LSD lethality in humans is sparse at best it seems: https://www.healthline.com/health/substance-use/can-you-overdose-on-lsd#risk-of-death