Review: LLI White Filter
The LLI (Lund Lights Inc) white filter is an aftermarket eyepiece filter designed to convert the green phosphor image of a standard night vision device into a white (grayscale) image. For users who own green phosphor tubes but want to experience the aesthetic of white phosphor without purchasing a new tube, the LLI white filter offers an inexpensive alternative.
What It Is
The LLI white filter is a small optical filter that attaches to the eyepiece of compatible night vision devices, most commonly the PVS-14. The filter absorbs the green wavelengths emitted by the P43 phosphor screen and transmits the remaining light as a neutral gray or white tone. The result is an image that approximates the appearance of a white phosphor (P45) tube, though with some important caveats.
Installation
Installation is straightforward. The filter is designed to friction-fit or thread onto the eyepiece assembly of the PVS-14. No tools are required, and the filter can be installed and removed in seconds. The compact design adds negligible weight and does not significantly change the eye relief or ergonomics of the device.
Image Quality
The LLI white filter does produce a grayscale image from a green phosphor tube, but it is important to set expectations correctly. The filter works by subtracting green wavelengths from the image, which inevitably reduces overall brightness. A filtered green phosphor tube will appear noticeably dimmer than the same tube without the filter, and it will not match the brightness of a true white phosphor tube with equivalent specifications.
The color rendering is also not a perfect match for true white phosphor. The filtered image tends to have a slightly cool or bluish cast rather than the pure neutral gray of P45 phosphor. Most users find this acceptable, but side by side with a genuine white phosphor device, the difference is visible.
In good ambient light conditions (quarter moon or brighter), the brightness reduction is generally tolerable and the grayscale image is pleasant to use. In very dark conditions (overcast, no moon), the brightness loss becomes more impactful and may push the image below the comfort threshold for some users.
Pros and Cons
Pros
- Inexpensive way to experience a grayscale night vision image
- Quick and easy installation and removal
- No permanent modification to the device
- Lightweight and compact
- Lets you decide if you prefer white phosphor before investing in a new tube
Cons
- Reduces overall image brightness
- Color rendering is not identical to true white phosphor
- Brightness reduction is most noticeable in the darkest conditions
- Does not change the underlying tube performance in any way
Verdict
The LLI white filter is a clever, affordable accessory for green phosphor night vision owners who are curious about the white phosphor look. It is not a substitute for a genuine white phosphor tube, and users should be aware of the brightness reduction. However, as a low-risk way to test your preference for grayscale imagery before committing to a costly tube swap, it serves its purpose well. Recommended as a trial accessory, not a permanent solution.