The Ray S20 is a clean looking stainless steel light. The head has a smooth bezel up the front with an in-set retaining ring which holds what the spec sheet describes as a coated mineral glass lens. Right behind the lens is a rubber o-ring for moisture resistance, it can be hard to notice because its white and not black, which matches the color of stainless steel. A lightly textured metal reflector does the job of focusing light output. Surface finish of the reflector is well done and nicely polished with no flaws. The LED sits at the bottom of the reflector cup, though it's just slightly off-center. The exterior of the head has some nice design touches which help with grip. Handy since the S20 is a twist activated light. Single-handedly activating the S20 poses no problems.

The entire surface of the S20 has a light sand-blaster type of finish. The threads between the head and battery tube mate nice and smoothly. Just behind the threads sits another rubber o-ring for water resistance. On the exterior, the battery tube has a plain cylindrical design. Thanks to the sand-blasted finish, it doesn't feel too slippery. Inside the bottom of the tube is a contact spring which means the battery won't rattle when the light is switched off with the head loosened. There's a four-point base at the rear which allows the light to tail stand without problems and also has four holes for lanyard attachments.

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The S20 is a simple and straight forward single mode light. Simply tighten the head to switch on, and loosen to off. The S20 supports both standard AAA which is advertised to output 86 lumens, and 3.7V li-ion cells for 210 lumens. Beam profile has a nicely focused hotspot and quite a large and bright corona around it. There are some subtle rings towards the outer edge of the spill, but it doesn't really affect practical usage. COlor temperature on the review sample is slightly cool. Runtime is average when running on an AAA battery, and regulation is on par with most other single AAA powered lights. Continuous running on 3.7V li-ion cells should be avoided due to heat issues, also stainless steel doesn't dissipate heat as well as aluminum.

The Good - Clean design is pocket friendly. Easily activated single-handedly.

The Bad - Heavy for it's size, as expected from bring made of stainless steel.

The Relative - Beam has a slightly cool white tint. Uses a twist switch. Is able to tail stand.