Transmissive LEP: Laser passes through a transparent sapphire substrate to excite the FCC. Reflective LEP: Laser excites the FCC mounted on a metal heat‑conducting substrate from the top.
Comparison of the Two LEP Architectures
Transmissive LEP features simple structure and low cost. However, limited by the thermal conductivity of sapphire, its maximum power is constrained, with brightness capped at 1000 cd/mm².
Reflective LEP employs a metal substrate for superior heat dissipation. It has no maximum power limit and delivers far higher brightness than transmissive LEP. Its downside is the higher cost.
Maximem Power Consumption | Maximum Brightness | Optical Structure | Cost | |
Transmissive LEP | 30W | 1000 cd/m㎡ | Simple | Low |
Reflective LEP | -- | 5000 cd/m㎡ | Complex | High |
External Impact Resistance
Owing to the high reliability of FCC material, neither transmissive LEP nor reflective LEP will suffer from direct laser emission after FCC burnout.
For reflective LEP, thanks to its reflective structure, even if the light‑output aperture and FCC material are damaged by external mechanical force, laser light will not be emitted directly, delivering superior safety performance.
