Luna Oculus – cycling RearView Camera and Proximity Alert with a novel twist
More: Luna Oculus (via Indiegogo, Zag Daily)
Luna Oculus comprises a smartphone app and radar taillight, similar in technology to Garmin RTL515 / RCT715, onscreen you get audio and visual indications of the distance of vehicles as they approach your rear.
None of that is new. What IS new is that Luna Oculus also offers a live-action rear-facing camera giving a similar effect to looking in your rearview mirror when driving a car. The company also crowdsources geo-located danger spots which, over time, could become an interesting resource for places to avoid when route planning.
See it in action here:
Once connected, the Luna Oculus app provides a livestream of what is happening behind. When other vehicles like cars, trucks, and other bikes get too close, the app provides a real-time visual as well as audio alerts which intensify the closer the approaching vehicles get, giving cyclists precious time to manoeuvre to a safer road position.
In-ride warnings are just one way in which we hope this solution will boost cyclists’ confidence. Our app will also provide heat mapping of close calls: vehicles that pass without giving sufficient space, near misses and, in the most unfortunate of cases, collisions. The aim is to allow cyclists to identify danger hotspots and to locate safer routes. [Fleury, CEO]
Take Out
The devil will be in the detail. How many false negatives will it produce? Does it detect multiple vehicles? and at what distance? How quickly will your phone’s battery be used? How much video is recorded and saved
I see this as a safety tool for casual cyclists and perhaps also commuters. As a rule of thumb, anyone wearing lycra will instead probably buy one of the Garmin/Magene/Bryton alternatives that integrate with bike computers.
Last Updated on 3 October 2026 by the5krunner
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
Reader-Powered Content
This content is not sponsored. It’s mostly me behind the labour of love, which is this site, and I appreciate everyone who supports it.
Support the site: Follow (free, fewer ads) · Subscribe (paid, ad-free) · Buy Me A Coffee ❤️
Written by real people, with AI assistance. Fact-checked and verified for originality. See the Editorial Policy. FTC: Affiliate Disclosure — some links pay commission. As an Amazon Associate, I earn from qualifying purchases.
tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
Any sights of the new Varia (with camera)? The update cycle used to be 2 years, so it’s time 😁
heard nothing.
i want a massive hike to its battery life
Same. I am running a Lupine C14 rear light that I basically charge like once a month or less, from how it feels. Sadly, no radar or ANT+ functionality, but accelerometer and brightness sensor means you basically wouldn’t need ANT+ support anyways. do several rides over 6h per year and in Germany, blinking lights aren’t allowed, which does not help with the total battery life. Additionally, if you want your battery to actually survive a long time, you should not have it run out (basically keep it between 20 and 80 %) which means, if I regularly do rides of 4-5h, any on bike gadget should have a minimum 8,5h battery life.
yup