UNV ULT Helmet Mount Kit with Binocular ADPTR

White phosphor costs more and offers better contrast and less eye fatigue. Green phosphor leverages the eye's peak sensitivity and costs less for equivalent tube quality. Here's what phosphor actually does, why neither wins in every situation, and how to decide.

Both are invisible to the naked eye and both are used with night vision — but IR lasers and IR illuminators do completely different things. Here's what each one actually does, when you need each, the civilian legal landscape for IR lasers, and what to look for when buying.

FOM is the most commonly cited spec for analog night vision tubes — and the most misunderstood. Here's what Figure of Merit actually measures, why two tubes with identical FOM can perform very differently, and what the number ranges mean in the real world.