12V vs. 24V permanent lighting: what's the difference?

The difference comes down to how power moves through the wire. Both 12V and 24V are low-voltage systems, and both can light a roofline. The practical difference shows up on long runs: to deliver the same amount of power, a 24V system can operate at half the current of a 12V system — and lower current means less energy lost in the wire and less voltage drop by the time power reaches the far end of a run. Starise runs 24V DC across our Gen 2 system for exactly that reason.

That's the honest version. What voltage doesn't do is guarantee quality — a well-engineered system depends on wire sizing, power planning, controller design, and component quality too. Here's what each part of that actually means for your home.

What voltage actually means

Voltage is the electrical "pressure" pushing current through a wire. Power — what actually lights the LEDs — is voltage multiplied by current. So the same amount of power can be delivered as higher voltage with lower current, or lower voltage with higher current.

That trade matters because wire itself resists current, and the energy lost to that resistance grows quickly as current rises. Run the same power at half the current and you lose substantially less in the wire. That's the entire engineering argument for 24V in one sentence: same power, less current, less loss.

Why voltage drop matters on a roofline

Picture a wide two-storey home in a Calgary suburb — garage out front, a couple of peaks, long eaves wrapping the front elevation. By the time you trace the channel from the power supply to the far corner, a run can easily stretch well past a hundred feet.

Every foot of that run adds resistance, and resistance eats voltage. If the system starts with less headroom — 12V instead of 24V — the same losses take a proportionally bigger bite. On a long run, that's the difference between lights that look uniform end-to-end and a far corner that's visibly dimmer or colour-shifted compared to the start.

Installers can work around voltage drop at any voltage — by using heavier wire or adding power injection (feeding power into the run at additional points). Those are legitimate techniques. But every added injection point is added hardware and added connections, and starting from 24V simply means needing fewer workarounds on the typical Calgary home.

12V vs. 24V at a glance

Why a permanent roofline run is different from an LED strip

If you've used a short LED strip indoors, voltage never came up — and that's the point. A 5-metre strip behind a TV doesn't run far enough for voltage drop to matter. A permanent roofline system is a different animal: runs measured in tens of metres, outdoor temperature swings, and a lighting effect that's judged from the street, where uneven brightness between one end of the house and the other is exactly the kind of thing your eye catches.

The longer the run, the more the starting voltage — and the quality of the power planning behind it — shows up in the final result. That's also why how many feet of lighting your home needs is one of the first questions in any serious quote.

Does 24V make the lights brighter?

Not inherently. Brightness comes from the LED module and how the system drives it — not from the voltage number on the power supply. A well-designed 12V module can outshine a poorly designed 24V one.

What 24V helps with is consistency: keeping the output at the far end of a long run looking like the output at the start. Uniformity, not raw brightness, is the real win.

Is 24V safer than 12V?

Not in any way that should drive your decision. Both are low-voltage systems, and both are safe when properly engineered and installed. On a Starise install, the only 120V portion — the connection from your home's electrical service to the power supply — is handled to Canadian Electrical Code standards, with the lighting itself running at 24V DC. Treat safety as a given with any competent installer at either voltage, and judge systems on performance instead.

Why Starise chose 24V

Our Gen 2 system runs 24V DC with individually addressable IP68 nodes seated every 8 inches in aluminium channel. We install on real Calgary homes — wide fronts, multiple peaks, long eaves — and 24V is the voltage that keeps those long runs uniform with less workaround hardware. It also pairs with lower current for the same output, which means less heat in the wiring — a small but real long-term benefit for a system that lives on your roofline year-round.

Voltage is one deliberate choice among several: sealed IP68 modules, recessed channel, certified components, and hardware rated for Alberta winters. No single spec makes a system good — but the specs a company chooses tell you how they think.