LED strip lights for accent and task lighting · 12 V vs 24 V, lumens and watts per foot or metre, LED density and drive per LED, copper weight and voltage drop, maximum run, CRI and cut intervals, power supply sizing
An LED strip light is a flexible circuit board carrying 18 to 36 surface-mounted LEDs per foot, supplied on a reel, cut to length and stuck in place for accent, cove, under-cabinet or task lighting. Ask three things first: the lumens per foot or metre and colour quality needed, since watts alone do not show brightness; the supply voltage and how long a run must be, since thin copper causes voltage drop and uneven light; and where it will be installed, since that sets IP protection and mounting.
Flexible LED strip lights and tape — single-colour, tunable white and RGB, 12 V and 24 V DC and mains-voltage types, indoor and waterproof — with connectors and channels. LED neon flex is noted where suppliers list it. Rigid LED bars, LED modules for signs, LED drivers sold alone and smart-home controllers are outside this page except where compared.
CNFX editorial research · Sources checked October 12, 2026 · 4 sources
Compare light output, colour quality and LED drive
Waveform Lighting's LED strip guide says strips consist of LEDs on a flexible circuit board, 18 to 36 LEDs per foot (60 to 120 per metre), cut along lines every 1 to 2 inches, shipped in reels of about 16 ft (5 m) with double-sided adhesive. Because LED efficiency varies, brightness should be compared in lumens per foot or metre rather than watts; a good-quality strip should provide 4 W per foot (15 W/m) or more, and dividing watts per foot by LEDs per foot shows whether LEDs are overdriven — the guide treats no more than about 0.2 W per LED as a good sign. Colour temperature and colour rendering index describe the white light. [1]
Its Absolute Series strip is an example of a high-colour-quality product: 99 CRI with R9 of 90 in 5000 K or 6500 K, 375 lumens per foot (1,250 per metre) at 4.2 W per foot on 12 or 24 V DC, cuttable every inch, built on 4 oz copper for reduced voltage drop, for indoor use only. [2]
Editorial calculation: 375 lm/ft at 4.2 W/ft is about 89 lm/W; a strip at 4 W/ft with 36 LEDs per foot runs each LED at about 0.11 W, while 18 LEDs per foot at the same power would be about 0.22 W each, just above the guide's 0.2 W mark. [2][1]
A European maker's data sheet states the same properties in metric units. Norlux's product data sheet for its SC-2835IP3-4000 strip (2026) lists a 24 V DC constant-voltage strip of 120 2835-type LEDs per metre at 14.4 W/m, 1,320 lm/m and 92 lm/W at 4,000 K, CRI ≥ 90 and 3-step MacAdam colour consistency, in a 5 m length, 10 mm wide (11 mm maximum), with adhesive-tape mounting and a 2 m cable. It is rated IP20 for indoor use only, −20 to 50 °C operating temperature with no heat sink needed, protection class III, inrush current of 25 A for 200 µs, and dimming dependent on the driver. [3]
Give the supplier the lumens per metre and colour temperature, CRI and R9, LED type and density, supply voltage, watts per metre, maximum run length and feed points, cut interval, IP rating and installation (indoor, outdoor, wet, pool), dimming and control (PWM, DALI, RGB, tunable white), connectors, aluminium channel and diffuser, certifications, reel length, and quantity.
02
Plan supply voltage, copper, run length and power supply
Waveform's guide says strips are configured for 12 or 24 V DC from a DC power supply, that 24 V is the better choice all else equal, and that the supply must cover total power: power equals watts per foot times length, so 5 ft at 4 W per foot needs 20 W. For higher-power strips it recommends copper of at least 2 oz, ideally 4 oz, so the circuit board can carry the current without voltage drop. [1] Its Absolute strip has a maximum run of 16.4 ft — one full reel — as a single consecutive run from a power supply; longer installations need additional feeds. [2]
Editorial calculation: a full 16.4 ft reel at 4.2 W/ft draws about 69 W, which is about 2.9 A at 24 V but 5.7 A at 12 V — half the current at the higher voltage for the same light, which is why 24 V suits longer runs. [2][1] Editorial note: size the power supply with headroom above the calculated load and confirm dimming compatibility with the supplier.
Editorial calculation: a 5 m Norlux reel at 14.4 W/m draws 72 W, or 3 A at 24 V (72 ÷ 24); its 25 A, 200 µs inrush is more than eight times that running current, so size the driver and any switch or relay for the inrush, not just for 72 W. The 1,320 lm/m ÷ 14.4 W/m = 91.7 lm/W matches its stated 92 lm/W. [3]
03
Check the maximum run length for the voltage and output you choose
Diode LED's options table for its BLAZE tape light, a 90+ CRI, dimmable, 120° beam strip rated for indoor and damp locations (IP20), sold on 16.4 ft, 100 ft and 400 ft spools and marked UL Listed and UL Component Recognized, gives a maximum run for each voltage and output class. At 3000 K the 12 V BLAZE 100 is listed at 121 lm/ft with runs up to 27 ft, and the 24 V version at 117 lm/ft with runs up to 55 ft; the brighter BLAZE 200 drops to 20 ft at 12 V and 40 ft at 24 V, and the 24 V BLAZE 300 at 344 lm/ft to 22 ft. Diode LED also states the product can be used to comply with JA8 high-efficacy LED lighting requirements under California's 2016 Title 24, Part 6. [4]
Editorial calculation: for the same output class, moving from 12 V to 24 V roughly doubles the listed run (27 to 55 ft, or 2.0×; 20 to 40 ft, 2.0×), and tripling the output at 24 V (BLAZE 100 to BLAZE 300) shortens the run from 55 to 22 ft, a factor of 2.5. This is consistent with the halved current at 24 V calculated in the section above; for a run longer than the listed maximum, plan a second feed from the power supply rather than linking reels end to end, and ask the supplier for the voltage drop chart behind its figures. [4]
The table also shows the long spools at a lower output per foot than the short ones in the same colour temperature — at 2700 K, 117 lm/ft on the 16.4 ft spool against 100 lm/ft on the 400 ft spool for the 12 V BLAZE 100 — so state the spool length when comparing lumens per foot. [4]
Suppliers linked to this page list LED strip lights; each card links to the page reviewed.
Listings include SMD and COB strips, RGB and addressable strips, rigid strips, LED neon strips and IP67 strips; ask each for lumens per metre, watts per metre, copper weight, maximum run, CRI and the test reports behind them.
05
Trace the strip construction
This is a functional reference built from the sources cited; it is not one maker's specification.
Element
Role
Fix in the order
Flexible circuit board
Carries current; copper weight limits voltage drop. [1]
Fill the specification fields with values for your project
An LED strip quotation needs values for your project. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.
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Compiled and source-reviewed by the CNFX editorial team.
Published product pages show what a company offers, not tested performance. Confirm the legal seller, factory and scope for your order. How we source and review
· Page last updated 13 October 2026
Buyer questions
Should I choose 12 V or 24 V LED strip?
Waveform Lighting recommends 24 V as the better choice; for the same power it draws half the current, which helps on longer runs. [1]
How do I size a power supply for LED strip?
Multiply watts per foot by length: 5 ft at 4 W/ft needs 20 W, then choose a supply with that capacity. [1]
How bright is a good LED strip?
Compare lumens per foot or metre; Waveform's 99-CRI strip gives 375 lm/ft (1,250 lm/m) at 4.2 W/ft. [1][2]
What inrush current does an LED strip draw?
Norlux's SC-2835IP3-4000 data sheet lists 25 A inrush for 200 µs on a 14.4 W/m, 24 V strip, against a running current of 3 A for a 5 m reel. [3]
How long can an LED strip run from one feed?
Diode LED lists its BLAZE 100 at up to 27 ft on 12 V and up to 55 ft on 24 V, and shorter runs for brighter versions (22 ft for the 24 V BLAZE 300). [4]
Sources and what still needs a direct check
Sources checked 2026-10-12. Waveform Lighting sells LED strips and describes its own products and buying advice; Norlux's data sheet gives metric figures for one 24 V strip; Diode LED's BLAZE options table lists maximum run length by voltage and output, as published by each maker.
