Integrated lights versus clip-on lights
An integrated light is wired to the bike. A clip-on light is a separate unit with its own battery that you fit to the bars or seat post. That's the whole split, but it changes how you buy, fit and charge.
What "integrated" means in practice
Integrated lights take their power from the bike's system, through a port. The maker's guide says that on full-power systems lights plug directly into motor light ports1. A cable runs from the light to the bike.
That cable is where the care goes. A maker's guide says that, depending on the bike, you may need a different frame cable entry port to accommodate the additional light cable1. The same guide says retailers should carry out the installation of wired lights for their riders1. So fitting is often a shop job, not a hobby one.
Rating is the other point. The guide's warning is blunt: unrated lights can cause permanent damage to the system1. A wired light has to match the bike's port. Your manual says what that is.
Most wired lights also come on with the bike. The maker's guide says most lights are permanently on when the system is powered1.
What "clip-on" means in practice
A clip-on light has its own cell. Many are charged from a USB port, since some headlamps use lithium-ion packs2. You charge it on its own, and you remove it when you lock the bike.
Cheaper ones can do the job. One reference says low-cost battery lights can be a good choice for occasional use, and usually meet legislative requirements2. It also says it's widely considered a good practice to have two rear lights in case a battery fails en route2.
Fitting needs no wiring knowledge. That's the draw. The trade-off is another battery to remember to charge.
Side by side
| Point | Wired to the bike | Clip-on |
|---|---|---|
| Power | The bike's system, within the port rating1 | Its own rechargeable or replaceable cell2 |
| Fitting | Retailers should carry out installation1 | Mounts on the bike, no bike wiring |
| Switching | Often on whenever the system is on1 | Has its own switch |
| Risk if mismatched | Unrated lights can damage the system1 | The light may not meet your local rules |
Questions to ask before you buy
- Does my manual list a light port, and what is its rating?
- Is the light I'm looking at rated for that port, in the maker's words?
- Does the light meet the rules where I ride? The maker's guide says to be sure a light is not only technically compliant, but in harmony with the country laws for running bicycle lights1.
- If it's clip-on, how long does the maker say a charge lasts, and what does its manual say about charging?
- Who will fit a wired light, and will that change my warranty? Ask the maker.
The powering page explains the power routes. For rules, see where to find lighting rules.
Where the facts come from
- Guideline to connecting wired lights, Specialized
- Bicycle lighting, Wikipedia
More lighting notes
How e-bike lights are poweredDoes your e-bike light run off the main battery, a small cell of its own, or a dynamo? Here's how to tell, and what a maker's guide says.
Lumens, lux and beam patterns explainedWhat lumens, candela and lux measure on a bike light's box, why one number can mislead, and how a beam pattern changes what you see.
Beam standards such as StVZO and what they coverWhat a bike light standard such as Germany's StVZO K-mark asks for, how other countries differ, and where to find the rules for your own country.