Olight FM20 Medium Filter

Made of rugged TPU, the Olight FM20 Medium Filter slips over the head of the flashlight and is available in red, green and blue colors as well as a white diffuser.

They are useful for navigating at night, hunting, law enforcement, and military applications, among others. Red light is commonly used to help to preserve night vision and also reduces the probability of alerting game animals, which generally do not pick up red light as well.

While also difficult for animals to see, green light additionally helps people with enhanced visual acuity as our eyes are more receptive to green light. Blue is often used by law enforcement to increase the visibility of sweat and blood, which also helps hunters with tracking animals. The white diffuser provides softer area light.

Filters are available in different sizes to fit multiple Olight flashlights.

FEATURES

• Constructed of rugged TPU with a lanyard hole
• Available with red, green and blue colored filters and a white diffuser
• FM20/DM20 Filters are compatible with: M20sx Javelot

Choosing the correct beam accessory

The model identity on this listing is FM20 Medium Filter. Olight accessories can use similar connectors, diameters or mounting patterns while remaining model-specific, so match the complete model designation—not appearance alone—before ordering.

Before checkout, compare the product name with the model already in use and inspect the saved photographs for connector, mounting and finish details. If any part of the model designation differs, confirm compatibility before treating the item as interchangeable. Keep the model label and order record for future replacement checks. This is especially useful when the original light, mount or charging accessory is later replaced. Retain any supplied instructions so another user can identify the same configuration correctly.

Beam accessory selection

The Olight FM20 Medium Filter changes how light is presented for the use described in the saved product information. Diameter and model fit matter: select the accessory by its exact code and compatible-light reference, not by colour alone.

Seat the filter or wand fully without forcing it. Before relying on it, confirm that it remains secure through normal handling and that heat can dissipate as intended. Remove it if the accessory is cracked, distorted or no longer grips securely.

Colour and intended signal

Different filter or traffic-wand colours are separate functional choices. Order the exact colour named on this page and check that it suits the signalling, visibility or beam-management task. A beam accessory does not increase the flashlight’s underlying output or runtime. Clean it with mild materials that will not scratch, cloud or distort the accessory.

Related Olight products

Browse more Filters products or visit the Olight range. Use the exact compatibility information on each page when pairing products and accessories.