Xtrallux Science Education Series

Every laser diode is a diode. Not every diode is a laser. Before comparing wavelengths, diode counts, or price tags, make sure you know what technology you're actually buying. This guide explains the differences between laser diodes and LEDs, why the distinction matters, and the questions every buyer should ask.

Surface-Mount (SMT) lasers, such as those used in Xtrallux devices, deliver laser light directly downward in a circular, concentrated beam — preserving energy density and maximizing power at the target. In contrast, traditional edge-emitting lasers, used by most manufacturers, produce elongated beams that spread laterally, prompting manufacturers to use crosshatch patterns to increase apparent coverage. While the same number of crosshatching lasers may illuminate a wider area, that broader spread comes at the cost of reduced energy concentration at the follicle. In therapeutic light delivery, focused energy — not expanded footprint — determines performance.

SMT changes that equation. By mounting each laser diode directly onto the surface of the circuit board, engineers can position lasers with far greater accuracy, reduce mechanical stress points, and achieve a slimmer overall profile. The result is a system capable of delivering more uniform, stable, and focused energy across the treatment zone.