Reading & Signaling Lenses: Very small flashlights (keychain/wrist) mainly for reading instruments (dive computers) or for safety signaling.
Backup / Spare Safety Lenses: The classic backup pocket flashlights that a diver always carries in case the primary one goes out.
Daytime Lenses: Lenses for recreational use, ideal for illuminating crevices and holes in the rocks during the day or for simple spearfishing.
Standard / Main Diving Lights: The standard primary flashlight for night scuba diving. It offers the ideal balance of brightness and battery life.
Demand & Photography Lenses: Powerful flashlights with a wide beam, suitable for demanding dives (e.g., deep dives, murky waters) or as a basic low-budget light for an underwater camera.
Professional Spotlights: Top lighting systems (usually Canister or High-End Video Lights) for technical diving (caves, wrecks) and professional video recording.