HMX FJ400 vs. Gateron Lunar Probe
An in-depth look at the HMX FJ400 and the Gateron Lunar Probe switches—which one is the best fit for you?
Overview
When it comes to choosing a mechanical keyboard switch, enthusiasts often find themselves at a crossroads between various options that cater to different preferences and typing experiences. The HMX FJ400, a member of the HMX Film switch lineup, is heralded for its balanced sound profile, making it an excellent choice for those seeking a versatile linear switch that can seamlessly adapt to both gaming and typing. On the other hand, the Gateron Lunar Probe offers a distinctive experience with its innovative dual rail mechanism, promising stability and consistency in every keypress, while delivering an exceptionally smooth and pre-lubed sensation complemented by a subtly refined sound signature. While both switches fall under the linear category, their unique characteristics can significantly influence your overall keyboard experience. However, let's dive in a bit deeper beyond generalities so you can best decide on the best switch for you.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
45g
Bottom-out force
58g
Bottom-out force
50g
Pre-travel
2.00 mm
Pre-travel
1.80 mm
Total travel
3.80 mm
Total travel
3.60 mm
Factory lubed
Yes
Factory lubed
Yes
Stem construction
Standard
Stem construction
Standard
Stem material
T2
Stem material
POM
Top housing material
POM
Top housing material
Polycarbonate
Bottom housing material
Nylon
Bottom housing material
Nylon
Mount type
PCB (5-pin)
Mount type
PCB (5-pin)
Spring
22mm single-stage spring
Spring
Double-staged spring
Housing materials
When comparing the housing materials of the HMX FJ400 and the Gateron Lunar Probe, it’s essential to note the distinct characteristics of their top housings. The FJ400 features a POM (Polyoxymethylene) top housing, which is renowned for its ability to produce a deeper and more muted sound profile. This design choice results in a unique acoustic experience that appeals to users who prefer a softer auditory response. In contrast, the Lunar Probe utilizes a polycarbonate top housing that delivers a sharper, higher-pitched, and crisper sound profile. Polycarbonate's rigidity contributes to a more resonant sound, making it an ideal choice for users who enjoy a brighter auditory feedback when typing. These differences suggest that the two switches serve varied aesthetic preferences in users based on sound perception, highlighting the influence of material choice on the overall typing experience.
Both switches share a common bottom housing material: nylon. This classic switch housing material contributes to a deeper and fuller sound profile, as nylon's softer plastic characteristics effectively absorb sound, producing a rounder auditory experience. This similarity means that regardless of the differing top housings, both the FJ400 and Lunar Probe will deliver a satisfying typing sensation in terms of sound. Thus, the nylon bottom housing of both switches allows users to experience consistent deeper sound characteristics, even when the top accents their auditory profiles differently.
Ultimately, the interplay between the two housing materials in each switch dictates the combined auditory and tactile experience. The top housing's influence is more pronounced when releasing a key, while the bottom housing plays a crucial role in the sound and feel upon bottoming out. Users of the FJ400 will experience a unique deep sound profile emphasized by the POM top, while those with the Lunar Probe will enjoy the crisper sound produced by the polycarbonate top. Despite the contrast in top materials, the combination of a nylon bottom housing in both switches ensures that they maintain a fundamental auditory similarity, providing enjoyable depth and fullness to the user experience.
Weight
When comparing the HMX FJ400 linear switch and the Gateron Lunar Probe linear switch, there are notable differences in both actuation and bottom out forces. The FJ400 features an actuation force of 50 grams and a bottom out force of 58 grams, positioning it as a medium-weight switch. In contrast, the Lunar Probe is lighter with an actuation force of 45 grams and a bottom out force of 50 grams, which makes it more suitable for users looking for a less strenuous typing experience. This lighter force allows for longer typing sessions without fatigue, ideal for office work or extended gaming. Additionally, the bottom out forces of both switches indicate that the FJ400 requires a bit more pressure to fully engage compared to the Lunar Probe. Ultimately, while both switches can deliver satisfying typing experiences, the FJ400 leans towards a heavier feel, making it preferable for those who enjoy a more substantial resistance in their keystrokes.
Travel distance
When comparing the travel distances of the HMX FJ400 linear switch and the Gateron Lunar Probe linear switch, the FJ400 stands out with a travel distance of 3.8 mm, while the Lunar Probe has a slightly shorter travel distance of 3.6 mm. This means that the FJ400 offers a deeper key travel experience, which may be more appealing to those who prefer a fuller feel when typing or gaming. Conversely, the Lunar Probe’s shorter travel distance caters to gamers who prioritize rapid response times and a more abrupt actuation. Given that both switches fall below the traditional 4.0 mm travel distance, those opting for the Lunar Probe may enjoy a quicker touch sensation, while the FJ400 will provide a more substantial engagement. Ultimately, the choice between these two switches boils down to personal preference for either a deeper or more responsive key feel.
Price comparison
Which switch is more bang for your buck?
The HMX FJ400 has an MSRP of $3.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the FJ400 for $3.29.
The Gateron Lunar Probe has an MSRP of $6.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the Lunar Probe for $4.19.
Here at Milktooth, we offer the best prices on switches (on average, 27% lower the competition). In addition, we offer free shipping on orders over $49.00. We also offer free returns and exchanges, so you can shop with guaranteed satisfaction.
That said, while price is an important piece of the puzzle, our opinion is that you should ultimately pick the option that most suits your unique preferences since you’ll be using these switches for years to come. In other words, finding something perfect for you is, in our view, the most important criteria.
Typing experience
The sound profile of the HMX FJ400 linear switch is characterized by a balanced quality, making it a versatile choice for various typing environments. This well-rounded nature allows for a pleasant auditory experience without being overly pronounced or harsh. In contrast, the Gateron Lunar Probe features a subdued sound signature, which produces a dampened noise when the keys are pressed. While it is not entirely silent, this subtle sound profile is less intrusive compared to many other mechanical switches, making the Lunar Probe an excellent option for those who prioritize a quieter typing experience, particularly in shared settings. Both switches offer a sound experience that can be influenced by the type of board and keycaps used, but they distinctly cater to different preferences.
When it comes to feel, the HMX FJ400 does not have a detailed description provided, so its specific qualities remain unknown. However, the Gateron Lunar Probe is renowned for its silky and polished typing experience, which reduces resistance during keystrokes and minimizes friction for a smooth operation. This switch's mild and subtle characteristics contribute to a gentle typing sensation that is accessible and comfortable for most users. The overall experience with the Lunar Probe is enhanced by factory lubing, providing an uninterrupted flow while typing. While the specifics regarding the FJ400's feel are lacking, the Lunar Probe undoubtedly delivers an appealing tactile experience.
Considering all available information, the HMX FJ400 presents itself as a balanced switch that is likely suitable for users seeking a versatile typing experience, although its specific sound and feel characteristics are not detailed. Meanwhile, the Gateron Lunar Probe stands out with its subdued sound and exceptionally smooth, polished feel, making it an attractive option for those desiring a refined and quiet typing experience. Ultimately, each switch offers unique qualities, and users may gravitate towards one or the other depending on their personal preferences or specific requirements for sound and feel in their mechanical keyboards.
Conclusion
To sum up, choosing between the HMX FJ400 and the Gateron Lunar Probe linear switches ultimately depends on your personal preferences and typing habits. If you prefer a moderate bottom-out force and are looking for a balance between sound and feel, the FJ400 is your go-to option. Its balanced sound profile makes it suitable for both work and casual environments, providing a pleasant auditory experience without being overly disruptive. On the other hand, if you favor a lighter touch and an exceptionally smooth typing experience, the Gateron Lunar Probe is likely the better choice. Its silky and polished feel offers an effortless typing sensation, making it ideal for long typing sessions or fast-paced gaming. The subdued sound signature of the Lunar Probe also makes it a great option for shared workspaces where noise levels need to be kept in check. In the end, consider your environment, how much force you prefer when typing, and whether sound dynamics matter to you when making your switch selection.
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