The ideal temperature for a vaporizer is about personal preference and medical needs. So yeah, I can't tell you the perfect temp to vape, because there isn't one, but I can tell you which vape to buy so you can start experimenting with precise control over temperature and effects.
Temperature as a Tool
Use the chart above to reference which effects you are seeking. Experiment by starting at a lower temperature and slowly move higher up the temp spectrum and observe your physical and mental states, pay attention to your body.
Vaporizing lets you relax and focus on the process of feeling the effects build up. Smoking is harsh and tends to hit you right away. Vaporizing, on the other hand, is a little more subtle to start off and builds over time. There is more of a curve from normal to high than a rocket straight up in the air. Now inhaling a full bag from the Volcano will bring about effects right away, but the full effects aren't present until a few minutes or more.
The point of all this is to try and focus our attention on the changes, to become more aware of the subtle medical properties of cannabis when we have more control over the temperatures we have more control over the effects.
Smoke vs Vapor
The boiling point of THC is 315°F, but active vapors start forming nearly 100° before that. When temperatures reach combustion (451°F) tars and other undesirable compounds such as benzene and dioxins are released (see the full list of 111 chemicals found in smoke) into the air. When ignited, temperatures soar to 600°F or higher.
The perfect temperature for dry herbs.
The ideal temperature for herb that is less dry, but not sticky.
This temperature is for sticky herbs.
When it’s sticky and dense, set it to this temperature.
This is for the densest, dank herbs and requires a hotter temperature.