What type of LED strip is best for stairs?

Waterproof IP65-rated LED strips at 2700K to 3000K warm white provide the best combination of durability and ambiance. Choose 60 LEDs per meter for smooth, even illumination.

Do stair lights need their own circuit?

Low-voltage LED strips run off a driver plugged into or wired from an existing lighting circuit; they do not need a dedicated breaker. If you are installing 120-volt recessed step lights, they wire like any other light fixture and count toward the circuit's load.

How bright should stair lighting be?

Code requires at least 1 foot-candle on treads and landings, but that is a minimum, not a target. Most comfortable installations deliver several times that at the tread, with the brightest light at the nosing line where depth perception matters.

Can I add LED strips to stairs that are already finished?

Yes. Low-voltage adhesive strips mount under the nosing with no cutting, and plug-in driver kits make a retrofit possible without opening walls. Plan the wire route to the driver first; that is the only part that usually requires any hiding.

Where should stair lights be placed?

The two proven placements are under-tread strips beneath each nosing, which wash light down the riser and onto the tread below, and recessed step lights in the wall or riser itself. Avoid placing fixtures at eye level where they create glare.

Do I need a permit for stair lighting?

Low-voltage retrofit kits typically do not require a permit, but any new 120-volt wiring or fixture in most jurisdictions does. Check with your local building department before cutting into walls.

Lighting Calculator

What Is the Lighting Calculator?

Plan LED stair lighting with this calculator: strip length, wattage, power supply size, and material cost in one pass. Lighting on a stair does two jobs at once: it satisfies the code requirement for stairway illumination, and it makes every tread edge visible so people stop misjudging steps. Most installations use LED strips tucked under the tread nosing, recessed step lights in the wall or riser, or a combination of both, and each layout changes the math: strip length, watts per foot, LED density, and power supply size. This calculator walks through the whole chain, from counting steps to sizing the driver. Before you enter numbers, know the baseline the International Residential Code sets: IRC R303.7 requires interior stairways to have an artificial light source capable of delivering at least 1 foot-candle of light, measured at the center of the treads and landings, with a wall switch at each floor level when the stair has six or more risers. Exterior stairs need a light at the top landing (R303.8). Meeting that baseline is the starting point; comfort, glare control, and energy use are what the design decisions after that are really about.

How to Use This Calculator

Enter the number of steps and the stair width. The calculator multiplies steps by width to estimate the total LED strip length, adding a small allowance for connections and corners.
Choose a lighting layout: under-tread strips tucked beneath each nosing, recessed step lights spaced along the wall or riser, or a hybrid of both. The layout changes how many fixture points the estimate counts.
Select an LED strip type: LED density (30, 60, or 120 LEDs per meter) and ingress rating (IP20 for dry interiors, IP65 for damp or exterior locations).
Enter the watts per foot for your chosen strip. Typical LED strips run from about 1.5 to 5 watts per foot; higher-density strips draw more but give smoother, dot-free light.
Review the total strip length and total wattage. This is the full connected load the power supply has to carry.
Size the power supply (driver) at roughly 120 percent of the calculated wattage. Running a driver near its maximum rating shortens its life and invites voltage drop problems, so the headroom is intentional.

Stair Lighting Calculator

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