| Energy type |
Single, coherent wavelength |
Broad spectrum (500–1200nm) |
| Precision |
High — targets melanin specifically |
Low — scattered energy affects multiple chromophores |
| Skin type compatibility |
All Fitzpatrick I–VI |
Limited (I–IV, with caution) |
| Sessions required |
4–6 for 80–90% reduction |
6–10 for 60–80% reduction |
| Treatment speed |
Fast (up to 20Hz, large spot sizes) |
Slow (lower repetition rate) |
| Hair color efficacy |
Dark, light, fine — all with multi-wavelength |
Dark hair only; ineffective on blonde, red, gray |