Voltage Guide
Choose the right voltage for your LED strip project
What voltage decides
An LED strip's voltage does not change how bright it is or how much power it uses; it changes how much current that power arrives as, and current is what decides how far one feed reaches, how thick the cable has to be and how many times a long run has to be fed.
So the question is not which rail is best. It is how long the run is, and how much wiring you are willing to do to feed it.
Quick Decision Guide
Animations & Effects
Choose 5V or 12V
Per-LED addressability for WLED, color chasing, and rainbow effects. 5V for short runs, 12V for longer strips.
Ambient & Constant Lighting
Choose 12V or 24V
For under-cabinet, cove lighting, and room perimeters. 24V for long runs, 12V for shorter or automotive use.
Side-by-Side Comparison
Current and reach are worked out on the same 14.4 W/m strip at full white, so the rails are comparing like with like rather than whatever each one is usually sold as.
| Spec | 5V | 12V | 24V | 48V |
|---|---|---|---|---|
| Current per metre | 2.88 A | 1.2 A | 0.6 A | 0.3 A |
| One feed reaches | 2.13 m | 4.25 m | 8.5 m | 12.75 m |
| On its heaviest strip | 1.75 m at 40.2 W/m | 3.5 m at 22.6 W/m | 7 m at 22.1 W/m | 15 m at 9.8 W/m |
| Cuts every | Every LED | Usually every 3 LEDs | Usually every 6 LEDs | Usually every 12 LEDs |
| Addressable families | 7 | 6 | 3 | 0 |
| Common Strips | WS2812B, SK6812, SK6812 RGBW, WS2813, SK9822 / APA102, WS2812B-mini 2020, Addressable FCOB | WS2815, WS2811, GS8208, TM1814, WS2814, Addressable FCOB, SMD 2835 white, SMD 5050 white, SMD 5050 analog RGB | TM1814, WS2814, Addressable FCOB, COB white, SMD 2835 white, SMD 5050 white, SMD 5050 analog RGB | COB white |
The heaviest strip on each rail is a different strip, which is why 48V reads further on its own worst case than on the shared one — nothing sold at 48V draws as much as the comparison figure. Reach is the distance one feed covers before the far end needs its own, and it is the same figure the PSU calculator marks injection points with. What it costs you to exceed it is in the voltage drop guide.
5V LED Strips
The widest choice of addressable chips, and the shortest reach of any rail.
Advantages
- +Every LED addressable one at a time, at the finest pitch available
- +The chip families almost every controller, library and tutorial assumes
- +Runs from USB power for small projects
Disadvantages
- -Draws the most current of any rail for the same light
- -Needs the thickest cable and the most feeds
- -5% of 5V is a quarter of a volt, so there is almost no margin for a long feed
One feed reaches
2.13 m
Strips run
4.5–40.2 W/m
Families here
7, 7 addressable
Best For
TV bias lighting, matrices, desks, anything under a few metres
12V LED Strips
Addressable strips that reach, at the cost of controlling three LEDs at a time on some chips.
Advantages
- +Roughly twice the reach of 5V for the same strip
- +The WS2815 gives per-LED control with a backup data line
- +The same rail as automotive and marine wiring
Disadvantages
- -WS2811 and most analog 12V strips address or cut in threes
- -Fewer addressable chips than 5V
One feed reaches
4.25 m
Strips run
4.4–22.6 W/m
Families here
9, 6 addressable
Best For
Under-cabinet, staircases, outdoor and holiday runs, most medium projects
24V LED Strips
The rail for long continuous light, and where COB is at its best.
Advantages
- +Half the current of 12V for the same wattage, so twice the reach again
- +Thinner cable and fewer feeds on a run of any given length
- +Where the dot-free COB and FCOB families live
Disadvantages
- -Addressable options are FCOB and a few chips rather than the full range
- -Cut points are further apart, so the strip fits a space less exactly
One feed reaches
8.5 m
Strips run
8–22.1 W/m
Families here
7, 3 addressable
Best For
Room perimeters, cove lighting, kitchens, anything over ~5 metres
48V LED Strips
Long architectural runs, and a catalogue you have to hunt for.
Advantages
- +The longest reach per feed of any rail here
- +The thinnest cable for a given wattage
Disadvantages
- -Almost nothing addressable is sold at this voltage
- -Few strips, few supplies, and both are harder to source
- -Over the 42V threshold some low-voltage wiring guidance draws
One feed reaches
12.75 m
Strips run
9.8 W/m
Families here
1, 0 addressable
Best For
Commercial and architectural runs past 15 metres
Where the difference comes from
One equation sets every column in the table above.
A 60W strip draws 12A at 5V and 2.5A at 24V. Same light, same wattage, a fifth of the current — and current is what warms the cable, sets the gauge and empties the strip's own copper before the far end. That loss is voltage drop, and it is why the last LEDs on a long run go dim and orange while the first ones look right. The voltage drop guide prices it: what the loss is worth in volts on each rail, and how to measure what your own run is losing. Where the feeds go once one is not enough is the power injection guide.
The rail also narrows which strips you can buy, and that half is the strip types guide: what each chip family controls, which rails it is sold on, and what a metre of it draws. And if a strip is already up and blinking rather than dimming, that is a different diagnosis — the flickering guide tells a power fault from a data fault off the symptom alone.
Questions
Which voltage should I choose for an LED strip?
Take the shortest rail that reaches. Under about two metres, 5V gives the widest choice of addressable chip and costs nothing in wiring. Between two and five metres, 12V halves the current and the number of feeds. Past five metres, or anywhere the run is one continuous line of light, 24V. 48V only for architectural runs past fifteen metres, where the catalogue is thin enough that the strip chooses you.
Is a 24V LED strip brighter than a 12V one?
No. Brightness comes from watts per metre, and both rails are sold in the same range of watts per metre. A 14.4 W/m strip is the same light at either voltage; the 24V version draws half the current to make it, which is why it reaches further on one feed and takes thinner cable. If a 24V strip looks brighter than a 12V one in a shop, it is a different strip, not a different rail.
Does the power supply voltage have to match the strip exactly?
Yes. A 12V strip on a 24V supply draws roughly twice the current it was designed for and the LEDs and their drivers fail, sometimes in seconds. The other direction simply underdrives: a 24V strip on a 12V supply lights dimly or not at all, and an addressable one may show the wrong colours. Supplies with an adjustable trimmer are worth checking with a meter before the strip is connected, since a few arrive set a volt high.
Is a lower voltage more efficient?
Not in the way it is usually claimed. How much light the strip makes per watt is set by the LEDs, not the rail. What changes is how much of the supply's output never reaches the LEDs: the same wattage at 5V is four times the current of 24V, and the loss in the wire goes up with it. So 24V is the more efficient installation, at identical strip efficiency.
Can I cut any LED strip anywhere?
Only at its marked cut lines, and the rail sets how far apart those are. A 5V addressable strip cuts between every LED. Most 12V strips cut every third, and most 24V strips every sixth, because those LEDs are wired in series groups to suit the voltage. It is the one practical cost of a higher rail: the strip fits an awkward length less exactly.
Can I run 5V and 24V strips from the same power supply?
No. A supply produces one voltage, so a build mixing rails needs one supply per rail, whatever the total wattage. Tie the negatives together if a single controller drives both, so the data has a shared reference. The PSU calculator sizes each rail separately for exactly this reason.
Which voltage do WLED and Home Assistant projects use?
Whichever the strip uses - the controller does not care. An ESP32 running WLED drives a 5V WS2812B, a 12V WS2815 and a 24V FCOB from the same data pin. What changes is the wiring: at 5V the controller can often share the strip's supply, while at 12V and above it needs its own 5V feed and a common ground with the strip.
Enter your strip and length to size the supply for the rail you picked.
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