Focus
A road light seen from two kilometres
- 5000 lm
- maximum output
- 55 g
- on the bar
- 4
- operational modes
BYB Focus is a 5000 lumen road safety light weighing 55 g. Four modes — high beam, front beacon, low beam, rear red — each rated by the distance a rider stays visible from: 2 km at the brightest, 500 m for the rear red.
The high beam fires from a button on the light or a wireless remote. The StVZO lens in the box gives the beam a hard cut-off: full output on the road, none in an oncoming driver's eyes.
Press the trigger
What a driver sees at two kilometres
You are in the car. The rider is two kilometres up an unlit road. Change the mode, pull the brightness down, then press the trigger the way he does — the lower button on the device, or the wireless remote.
A dark road seen from inside a car, with a road cyclist two kilometres ahead lit by BYB Focus.
- Output
- 5000 lm
- Seen from
- 2 km
- Endurance
- 1000 flashes
Reviewed
What a reviewer found on a dark rail trail
“I'm not a fan of flashing front lights… but it's very very flashy bright.”
- Funded and shipped
- Every backer's unit delivered.
- $100,000
- of lights sold
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Also featured in
Four modes, and only one of them is for seeing
A road light has two jobs and they pull in opposite directions: being seen by traffic, and lighting the road. Focus separates them into four modes rather than compromising into one.
| Mode | Output | Seen from | When | Endurance |
|---|---|---|---|---|
| High beam | 500–5000 lm | 2 km | Day and night | 1000 flashes |
| Front beacon | 5000 lm | 2 km | Day and night | 20+ hours |
| Low beam | 800 lm | 80 m | Night | 6+ hours |
| Rear red | 300 lm | 500 m | Day and night | 20+ hours |
High beam
Adjustable from 500 to 5000 lumens, and visible in daylight. Fired from the device's lower button or the wireless remote trigger, and held on for longer when the road ahead needs reading rather than announcing.
On-device trigger · wireless remote trigger
Front beacon
As bright as the high beam, blinking rather than steady, and sustainable for over twenty hours. The mode for being seen in daylight, which is when most riders are hit.
Single, double and triple blink · heartbeat · wave
Low beam
The seeing mode: 800 lumens held steady for six hours or more, throwing 80 metres up the road. The StVZO cut-off is what makes it usable on a public road at night.
StVZO compliant cut-off
Rear red
Focus turned around. 300 lumens of red, visible from 500 metres for over twenty hours — which is the mode for the night a rear light runs out of charge.
Single, double and triple blink · heartbeat · wave
The obvious objection
Does 5000 lumens dazzle everyone else?
No, and the answer is a lens rather than a promise. Fit the StVZO lens and the beam gets a hard horizontal cut-off: full output below the line, nothing above it.
The lens ships in the box. It is not an accessory to buy later.
Five thousand lumens out of a 55 gram box
The hard part of a light this bright is not the output. It is getting rid of the heat, surviving the current draw, and doing both without a metal heatsink to carry the weight.
No metal heatsink at all. Power dissipation is handled by 3 grams of lightweight fibreglass composite.
Custom-engineered optics: high candela, low optical glare, and StVZO compatible with the supplied lens.
A drone battery: the same high-discharge, special-chemistry cell a drone uses. Which is what a 5000 lumen burst actually needs.
A temperature sensor watches the LED, and the electronics auto-adapt from −20 °C to +50 °C so neither the LEDs nor the optics are damaged. The closed-loop check runs every 50 milliseconds.
5000 lumens on demand from three LEDs, with the chip substrate pre-heated first.
- Movement sensorSensor
- Can be set to switch Focus on when the bike starts moving and off when the ride ends, which is the switch riders forget.
- Ambient light sensorSensor
- Sets output against the light around it, so the beam stays noticeable at midday and stops being blinding at midnight.
- Dual-core processor
- Runs the modes and a low-power wireless link to the phone.
- Tilt sensorSensor
- Reports the mounting angle, so the beam is aimed at the road rather than at oncoming faces.
- Fast charging circuit
- Charges over USB-C, from the cable in the box.
Every mode is configurable from the phone
Focus pairs over a low-power wireless link. Every setting is changed on the bike, with no tools and nothing to unclip.
The app sets
- Maximum brightness, per mode
- The blink pattern
- Night dimming
- The buzzer
The light reports
- LED temperature
- Mounting angle
- Battery level
- Flashes left in the current setting
What is in the box
Focus is the one product in the range whose box contents BYB Tech publishes.
- Every mounting needed
- The wireless handlebar trigger
- The StVZO anti-glare lens
- USB-C charging cable
FAQ
Questions about the safety light
- How bright is BYB Focus?
- 5000 lumens at maximum, in both the high beam and the front beacon mode. The high beam is adjustable down to 500 lumens, low beam runs at 800 and the rear red at 300.
- Will Focus dazzle oncoming traffic?
- Not with the StVZO lens fitted, which ships in the box. It gives the beam a hard horizontal cut-off — full output below the line, nothing above it.
- How long does the battery last?
- It depends on the mode, because they do different jobs. The front beacon and the rear red run for over twenty hours. Low beam holds 800 lumens for six hours or more. The high beam is quoted in bursts rather than hours: about 1000 flashes.
- Is the wireless handlebar trigger included?
- Yes. The wireless handlebar trigger ships in the box, in its own compartment, along with the mountings, the StVZO anti-glare lens and a USB-C cable. It is not a separate purchase. The high beam can also be fired from a button on the light itself.
- Can Focus be used as a rear light?
- Yes. Rear red mode gives 300 lumens visible from 500 metres for over twenty hours, with the same pattern and intensity control as the front modes. It is the mode for the night a rear light runs out of charge.
- Can Focus be used on a mountain bike?
- Yes, it fits a mountain bike. It is designed for the road, though, and that shows in what it optimises for: the StVZO cut-off, the daylight beacon and the 2 km visibility figures are all about being seen by traffic. Off-road at night the mode that matters is the low beam — 800 lumens, 80 metres, six hours or more.
- How is the high beam switched on?
- From the lower button on the device, or from a wireless remote trigger. The upper button powers Focus and changes mode. Everything else is set in the app.