Isku-darka fallaadhahan, oo laga sameeyay BK7 (H‑K9L) ama silica la isku daray, waxay isku daraan laba fallaadho soo socda (UV, muuqda, ama u dhow‑IR) hal wax soo saar. Iyagoo u oggolaanaya isticmaalayaasha inay iftiinka muuqda ku daboolaan shucaaca laysarka aan la arki karin, waxay si weyn u fududeeyaan habka isku-dubaridka.
Wavelength waxay diiradda saareysay bixinta alaabada indhaha ee saxsan ee sare muddo 20 sano ah