SL A4 Road Light Set

Our first bicycle lamp for road traffic: 900 lumens of glare-free, sensor-controlled daytime running light and proven Lupine battery technology.
ITEM No: 3301  


This glare-free, 900-lumen, sensor-controlled light an the absolute must for your road ride. The automatic daytime running light increases your visibility on the road. 
Type of light: Bike light/Road ready
Light output: 900 Lumens
Runtime: 1:30 h
Runtime Max: 16 h daytime running light
Reach FL1: 250 m
Battery: 3.3 Ah SmartCore
Capacity indicator: with SmartCore
Weight incl. battery: 230 g
Battery setup: with velcro strap
Delivery content: Lamphead SL A, 3.3 Ah SmartCore battery, Wiesel charger, Long and Short battery straps, Manual, 31.8 mm handlebar mount (Stem width: 39 - 51 mm), Torx 6, Torx 15
In Stock:  Yes
US $425.00
Bike Mount option: 


For over 25 years Lupine Lights has helped mountain bikers win races, illuminate the most challenging outdoor adventurers, and provided reliable light sources for life-saving rescue missions. Lupine's years of experience in precision-manufacturing paired with ongoing innovation in LED technology, elevate the new SL A to the ideal road-use light.


1. Daytime running light blinks for ultimate visibility and safety
2. Daytime and nighttime running light can run at the same time (trail mode)

Read the Manual (coming soon)


High-tech stereo-sensors scan the ambient light and automatically switch the SL from daytime running light to full beam. This function is especially handy at high speeds, when you may not have time to react.


The heart of the SL is composed of 12 high intensity LEDs and the world's first dual Aspheric Lens System for bike lights. Their extremely robust and high quality aluminum body protects the SL from shock, dust, and water.

The SL is a special member of the Lupine family of lights. Not only is it compliant with strict e-bike light standards, but it also directs 100% of its 900 lumens directly on your path. The SL is designed like a car headlight and doesn't glare any other road users.


Mounting the SL A is very simple and compatible with Stem widths of 39-51mm. 


The SL is incomparable. Its unique look is due not only to the distinctive "daytime running light" but above all to the development performance of our engineers. With the SL, they created the smallest and lightest lamp in its class.



Lupine offers 20-plus years of precision-manufacturing and high-tech innovation- made in Germany.

We are one of the best in the industry relative to:
  • System weight to lumen output ratio
  • Price to lumen output ratio
We offer the best warranty in the industry. And, we take pride in our customer support and service team that can service your light directly at our Pennsylvania location.

SL A 7

SL A 4
Runtime 16 W / 900 Lumens 3 Hours 1:30 Hour
Runtime 8 W / 500 Lumens 6 Hours 3 Hours
Runtime 1.5 W / 0 Lumens 32 Hours 16 Hours
Weight 320g 215g

Hardcase & SmartCore BatterySmartCore 6.6 Ah

Hardcase & SmartCore BatterySmartCore 3.3 Ah
Material Casing polyamide, layer polyurethane
Battery 7.2V 6.6Ah 3.3Ah
watt hours 48Wh 24Wh
Weight 240g 135g
Recommended for all Lupine Lampheads Neo, Piko
Protection class IP 68 (waterproofness ), IK 09 (impact strength)
Cell type Panasonic NCR18650B
High current 6C 3C
SmartCore technology Advanced battery management
Lexan Touchpad with 5 Hyper Red LEDs
Capacity indicator 10% steps via 5 Hyper Red LEDs
Taillight Function With SmartCore only
Running Light Function With SmartCore only
Balancing function CV (constant voltage)
Calibration function through Lexan-Touchpad when connected to charger
Audible signal 60dB
Microprocessor 14-Bit RISC
PCB Reversible cut-off at short circuit, overvoltage, undervoltage

ChargerWiesel (North American plug)
Charge current 0.1 - 1.2A
Input voltage 100 - 240V~
Frequency 50 - 60Hz
Display Charging control via 1 LED
Compatible batteries Lupine Li-Ion Batteries - 7.2V
Functions Li-Ion Charge
Microprocessor controlled yes

LampheadSL A 900 Lumens - 16W
Dim levels 1,5W daytime running light; 8W; 16W
Special modes automatic mode
Material Aluminium 6061-T6, CnC milled
Weight 80g
Dimensions (LxWxH) 40 x 50 x 48mm
Protection class IP68;IK09
Functions Daytime running light, 2 steps full beam, automatic mode, RVLR
Lens 26° Dual Aspheric Lens System
Illuminant 12 Luxeon High Intensity LEDs
LED-Board Aluminium: Directbonding Thermalpad
Colour temperature 6000K (5% tolerance)
Converter phase 50KHz
Corespeed 32MHz
Conducting path structure Fine Pitch smaller 0.2 mm
Temperature control active
Ambient temperature -25°C to +70°C
 Average Rating:  5 Star Rating
 based on 4 Customer Reviews  
Write A Review
   Durability and Endurance, September 7, 2019  By Adam Carr (Colchester, VT)
While I have only had this light a short period now my experience is similar to the other unit that I own - the ROTLICHT rear tail light.

This light is expensive - as was the rear light relative to cheaper options. However both units do what you would expect from the expense in that they seem to outlast in longevity and durability. While I don't go out of my way to drop my expensive lights it has certainly happened with my tail light. Durability comes at a price but for something I want to buy once and keep for years to come I am happy.

Most important for me beyond that is the battery life and the variable battery options. A smaller pack for general commuting that seems to last a good long while - and a larger battery for some serious evening excursions. I don't plan on doing an eco trek any time soon but I definitely enjoy quieter roads at dusk or after dark. This light also seems to be unique in that the shape and falloff of the light looks very similar to a motorcycle and doesn't seem to blind people.

So far I have enjoyed the mounting system as I have it mounted on the bottom of my garmin mount using a go pro adapter.

5 stars for German quality.
   SLA-4 1 year checkin, April 18, 2019  By Charlie Olmsted (Hershey, PA)
In follow up to my April 2018 review, I wanted to let folks know my SLA continues to deliver. Great daylight running light for safety, long battery life and a seamless transition to full beam as the sun sets on early spring rides. Best front light ever! Pairing with the Rot light makes for the perfect match.
   Amazing commuter light, June 17, 2018  By Robert Hollyer (Bainbridge Island, WA)
I use the SL-A head light on my daily 30-mile commute. Honestly, for myself this is the perfect light. The beam pattern is excellent. It's wide with a sharp cutoff and doesn't blind oncoming pedestrians and cyclists. The light output (lux) is excellent. The daytime running light seemed pointless but in fact it works great and is noticeably bright while not being blinding. The battery pack has a nice led state-of-charge indicator. However, the audible status is pretty quiet. You need to be indoors for the audible beep to be useful.

I bought the optional quick release mount and it works perfectly. Well engineered and easy on/off. Probably the only downside to the light is the power adapter and the power connector. They're both non-standard and the connector has a tight fit. Presumably for waterproofing. But with USB Type C experiencing wide spread adoption and at high power capabilities, it would make more sense than a non-standard power supply and connector.

Overall, this light is expensive but worth it.
   SL A4 Road Light, April 19, 2018  By Charlie Olmstwd (Hershey, PA)
The SL A4 is the perfect front head light for road cycling. I started using the SL A4 on my road bike this spring when I decided to maximize my visibility for safety reasons and desired long running batteries. So after using the light for over a month, I can say that the daytime running light LED technology is the real deal if you desire enhanced visibility to on coming traffic. Also the run time of this unit is far superior to an other front light I have ever tested. Simple operation, just two clicks to turn on and one long click to shut off. Once powered on the light automatically senses if it needs to be in daylight running mode or a full headlight....very cool!