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Mean Well HLG-40H-12 Power Supply 40W 12V 3.33A

4.9 (21 reviews)
premium quality7 years warrantyaluminium casinghigh efficiency
SKU HLG-40H-12
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Model

Select model — 16 in this family

HLG-40H-12
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Overview

HLG-40H-12 is the 12V output model of this series: rated current 3.33A, rated power 39.96W, typical efficiency 86.5%. Type Blank: Io and Vo fixed (IP67).

HLG-40H series is a 40W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-40H operates from 90~305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 89.5%, with the fanless design, the entire series is able to operate for -40 ~ +80 case temperature under free air convection. The design of metal housing and IP67 ingress protection level allows this series to fit both indoor and outdoor applications.

Features

  • Constant Voltage + Constant Current mode output
  • Metal housing with class I design
  • Built-in active PFC function
  • Class 2 power unit
  • IP67 rating for indoor or outdoor installations
  • Typical lifetime > 62000 hours
  • 7 years warranty

Specifications

HLG-40H-12Specifications from the official datasheet (2026-02-04 edition)

OUTPUT

DC VOLTAGE
12V
CONSTANT CURRENT REGIONNote.4
7.2 ~12V
RATED CURRENT
3.33A
RATED POWER
39.96W
RIPPLE & NOISE (max.)Note.2
150mVp-p
VOLTAGE ADJ. RANGE
10.8 ~ 13.5V
CURRENT ADJ. RANGE
2 ~ 3.33A
VOLTAGE TOLERANCENote.3
±2.5%
LINE REGULATION
±0.5%
LOAD REGULATION
±2.0%
SETUP, RISE TIMENote.6
500ms,80ms/115VAC 500ms,80ms/230VAC
HOLD UP TIME (Typ.)
16ms / 115VAC, 230VAC

INPUT

VOLTAGE RANGENote.5
90 ~ 305VAC 127 ~ 431VDC (Please refer to "STATIC CHARACTERISTIC" section)
FREQUENCY RANGE
47 ~ 63Hz
POWER FACTOR (Typ.)
PF≧0.98/115VAC, PF≧0.95/230VAC, PF≧0.92/277VAC @ full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION
THD< 20% (@ load≧60% / 115VAC,230VAC; @ load≧75% / 277VAC) (Please refer to "TOTAL HARMONIC DISTORTION (THD)" section)
EFFICIENCY (Typ.)
86.5%
AC CURRENT (Typ.)
0.43A / 115VAC 0.24A / 230VAC 0.23A / 277VAC
INRUSH CURRENT(Typ.)
COLD START 50A(twidth=210μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
MAX. No. of PSUs on 16A CIRCUIT BREAKER
12 units (circuit breaker of type B) / 20 units (circuit breaker of type C) at 230VAC
LEAKAGE CURRENT
<0.75mA / 277VAC

PROTECTION

OVER CURRENT
95 ~ 108% Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT
Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
15 ~ 21V
OVER TEMPERATURE
Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.
Tcase= -40 ~ +80℃ (Please refer to "OUTPUT LOAD vs TEMPERATURE" section)
MAX. CASE TEMP.
Tcase= +80℃
WORKING HUMIDITY
20 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +80℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 60℃)
VIBRATION
10 ~ 500Hz, 5G 12min./1cycle, period for 72min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDSNote.8
UL8750(type”HL”), CSA C22.2 No. 250.0-08 , BS EN/EN/AS/NZS 61347-1,BS EN/EN/AS/NZS 61347-2-13 independent , GB/T19510.1,GB/T19510.213,EAC TP TC 004,KC61347-1,KC61347-2-13, IP67 approved ; J61347-1 , J61347-2-13 ; design refer to BS EN/EN60335-1(by request)
WITHSTAND VOLTAGE
I/P-O/P:3.75KVAC I/P-FG:2KVAC O/P-FG:1.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSIONNote.8
Compliance to BS EN/EN55015, BS EN/EN61000-3-2 Class C (@ load≧60%) ; BS EN/EN61000-3-3,GB/T 17743 , GB17625.1, KS C 9815, KS C 9547, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11; BS EN/EN61547, BS EN/EN55024, light industry level (surge immunity Line-Earth 4KV, Line-Line 2KV), KS C 9815, KS C 9547, EAC TP TC 020

OTHERS

MTBF
3395.8K hrs min. Telcordia SR-332 (Bellcore) ; 345.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
171*61.5*36.8mm (L*W*H)
PACKING
0.73Kg; 20pcs/15.6Kg/0.9CUFT

Certifications & ratings

Type
HL

MODEL ENCODING

Blank (this model)
Io and Vo fixed; IP67
A
Io and Vo adjustable through built-in potentiometer; IP65
B
3 in 1 dimming function (1~10VDC, 10V PWM signal and resistance); IP67
AB
Io and Vo adjustable through built-in potentiometer & 3 in 1 dimming function (1~10Vdc, 10V PWM signal and resistance); IP65
D
Timer dimming function, contact MEAN WELL for details(safety pending); IP67
Test conditions and notes13
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. Please refer to "DRIVING METHODS OF LED MODULE".
  5. 5. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
  6. 6. Length of set up time is measured at first cold start. Turning ON/OFF the driver may lead to increase of the set up time.
  7. 7. The driver is considered as a component that will be operated in combination with final equipment. Since EMC performance will be affected by the complete installation, the final equipment manufacturers must re-qualify EMC Directive on the complete installation again. (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
  8. 8. To fulfill requirements of the latest ErP regulation for lighting fixtures, this LED driver can only be used behind a switch without permanently connected to the mains.
  9. 9. This series meets the typical life expectancy of >62,000 hours of operation when Tcase, particularly tc point (or TMP, per DLC), is about 75℃ or less.
  10. 10. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com.
  11. 11. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
  12. 12. For any application note and IP water proof function installation caution, please refer our user manual before using. https://www.meanwell.com/Upload/PDF/LED_EN.pdf
  13. 14. Products sourced from the Americas regions may only have the UL, CE and UKCA logos. Please contact your MEAN WELL sales for more information.

Technical drawings

HLG-40H-12 BLOCK DIAGRAM
BLOCK DIAGRAM
HLG-40H-12 Illustration (page 5)
Illustration (page 5)
HLG-40H-12 OUTPUT LOAD vs TEMPERATURE(Note.10)
OUTPUT LOAD vs TEMPERATURE(Note.10)
HLG-40H-12 STATIC CHARACTERISTICS
STATIC CHARACTERISTICS
HLG-40H-12 TOTAL HARMONIC DISTORTION
TOTAL HARMONIC DISTORTION
HLG-40H-12 MECHANICAL SPECIFICATION ※Blank/D-Type
MECHANICAL SPECIFICATION ※Blank/D-Type
HLG-40H-12 ‧tc : Max. Case Temperature
‧tc : Max. Case Temperature
HLG-40H-12 WATERPROOF CONNECTION
WATERPROOF CONNECTION
HLG-40H-12 WATERPROOF CONNECTION (2)
WATERPROOF CONNECTION (2)

Typical applications

  • LED street lighting
  • LED high-bay lighting
  • Parking space lighting
  • LED fishing lamp
  • LED greenhouse lighting
  • Type “HL” for use in ClassⅠ, Division 2 hazardous (Classified) location.

Downloads

FAQ

Can I use the HLG-40H-12 to power 12V LED strip lighting under a deck or patio?

Yes. The HLG-40H-12 outputs 12V at up to 3.33A (40W) and carries an IP67 waterproof rating, so it can be mounted outdoors under decks, patios, or pergolas where it may be exposed to rain, splashing, or humidity.

Is the HLG-40H-12 a good fit for a small 12V LED accent lighting project?

Yes. At 40W it is well sized for compact accent lighting runs such as display case lighting, cove lights, or under-cabinet strips operating at 12V. Its compact dimensions of 171 x 61.5 x 36.8 mm also make it easy to conceal in tight spaces.

Can the HLG-40H-12 power 12V LED modules in a small outdoor sign?

Yes. It delivers up to 40W at 12V, which is enough for a small channel-letter or lightbox sign using 12V LED modules. The IP67 waterproof rating ensures reliable operation even when the driver is exposed to rain or mounted inside a non-sealed sign cabinet.

How many meters of 12V LED strip can the HLG-40H-12 support?

Divide 40W by the strip's rated power per meter. For example, a 12V strip consuming 5W/m would allow up to 8 meters (40W / 5W per meter = 8m). Check your strip's rated power per meter and keep total load at or below 40W.

Can the HLG-40H-12 be mounted outdoors in direct rain?

Yes. The IP67 waterproof rating means the unit is protected against temporary submersion up to 1 meter of water. It can be mounted in direct rain, near sprinklers, or in other wet locations without additional weatherproofing.

What are the differences between the HLG-40H-12, 12A, 12AB, and 12B models?

All four share the same 40W / 12V / 3.33A core specs with a CC range of 7.2-12V. The base HLG-40H-12 has fixed output and is IP67 waterproof. The -12A adds output voltage/current adjustment via built-in potentiometer (IP65). The -12AB adds both adjustment and 1-10V/PWM dimming input (IP65). The -12B provides dimming input only and retains IP67.

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Other HLG-40H Models

2 other models
ModelPowerVoltageCurrentIP Rating
Mean Well HLG-40H-24 Power Supply 40W 24V 1.67A 40.08W 24V 1.67A IP67 View
Mean Well HLG-40H-24A Power Supply 40W 24V - Adjustable 1.67A 40.08W 24V 1.67A IP65 View

Customer reviews

4.9 Reviews verified for authenticity
5 ★ (19)
4 ★ (2)
3 ★ (0)
2 ★ (0)
1 ★ (0)

Reviewed by 21 customers across the HLG series

  1. Best outdoor driver we use

    By Hemi K.|2026-06-22✓ Verified Buyer
    Model: HLG-240H-24Quantity: 6

    HLG-240H-24 is IP67 and just keeps going. Powering a car-park flood install, 8 months no issues.

  2. Premium, worth it

    By Bright Spark|2026-06-01✓ Verified Buyer
    Model: HLG-185H-24Quantity: 4

    Built-in PFC, runs cool, DALI option on the B model. Our go-to.

  3. Flawless

    By Olivia D.|2026-05-09✓ Verified Buyer
    Model: HLG-320H-48Quantity: 2

    Drove a 48V architectural run for months, dead silent.

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Mean Well HLG-40H-12 Power Supply 40W 12V 3.33A
Mean Well

Mean Well HLG-40H-12 Power Supply 40W 12V 3.33A

HLG-40H-12 is the 12V output model of this series: rated current 3.33A, rated power 39.96W, typical efficiency 86.5%. Type Blank: Io and Vo fixed (IP67).

HLG-40H series is a 40W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-40H operates from 90~305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 89.5%, with the fanless design, the entire series is able to operate for -40 ~ +80 case temperature under free air convection. The design of metal housing and IP67 ingress protection level allows this series to fit both indoor and outdoor applications.

Features

  • Constant Voltage + Constant Current mode output
  • Metal housing with class I design
  • Built-in active PFC function
  • Class 2 power unit
  • IP67 rating for indoor or outdoor installations
  • Typical lifetime > 62000 hours
  • 7 years warranty

Typical applications

  • LED street lighting
  • LED high-bay lighting
  • Parking space lighting
  • LED fishing lamp
  • LED greenhouse lighting
  • Type “HL” for use in ClassⅠ, Division 2 hazardous (Classified) location.

Model

  • 120W 12V
  • 120W 12V Adjustable
  • 120W 12V Adjustable and Dimmable
  • 120W 12V Dimmable
  • 150W 12V
  • 150W 12V Adjustable
  • 150W 12V Adjustable and Dimmable
  • 150W 12V Dimmable
  • 40W 12V
  • 40W 12V Adjustable
  • 40W 12V Adjustable and Dimmable
  • 40W 12V Dimmable
  • 60W 12V
  • 60W 12V Adjustable
  • 60W 12V Adjustable and Dimmable
  • 60W 12V Dimmable
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