Mean Well HLG-40H-12B Power Supply 40W 12V - Dimmable

Name: Mean Well HLG-40H-12B Power Supply 40W 12V - Dimmable 3.33A
Brand: Mean Well
SKU: HLG-40H-12B
Price: 42.65 USD
Availability: InStock

Overview

HLG-40H-12B is the 12V output model of this series: rated current 3.33A, rated power 39.96W, typical efficiency 86.5%.

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/IP65 ingress protection level allows this series to fit both indoor and outdoor applications. HLG-40H is equipped with various function options, such as dimming methodologies, so as to provide the optimal design flexibility for LED lighting system.

Features

Constant Voltage + Constant Current mode output
Metal housing with class I design
Built-in active PFC function
Class 2 power unit
IP67 / IP65 rating for indoor or outdoor installations
Function options: output adjustable via potentiometer; 3 in 1 dimming; Timer dimming
Typical lifetime > 62000 hours
7 years warranty

Specifications

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

OUTPUT

DC VOLTAGE: 12V
CONSTANT CURRENT REGION^Note.4: 7.2 ~12V
RATED CURRENT: 3.33A
RATED POWER: 39.96W
RIPPLE & NOISE (max.)^Note.2: 150mVp-p
VOLTAGE ADJ. RANGE: Adjustable for A/AB-Type only (via built-in potentiometer)
VOLTAGE ADJ. RANGE: 10.8 ~ 13.5V
CURRENT ADJ. RANGE: Adjustable for A/AB-Type only (via built-in potentiometer)
CURRENT ADJ. RANGE: 2 ~ 3.33A
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±2.0%
SETUP, RISE TIME^Note.6: 500ms,80ms/115VAC 500ms,80ms/230VAC
HOLD UP TIME (Typ.): 16ms / 115VAC, 230VAC

INPUT

VOLTAGE RANGE^Note.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 STANDARDS^Note.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 (except for AB-type), IP65 or 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 EMISSION^Note.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

Test conditions and notes14

1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
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. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Please refer to "DRIVING METHODS OF LED MODULE".
5. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
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. 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. 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. 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. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com.
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. 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. For A/AB type need to consider build in using to comply with Type HL application.
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-12B BLOCK DIAGRAM — BLOCK DIAGRAM

HLG-40H-12B DIMMING OPERATION — DIMMING OPERATION

HLG-40H-12B Illustration (page 5) — Illustration (page 5)

HLG-40H-12B OUTPUT LOAD vs TEMPERATURE(Note.10) — OUTPUT LOAD vs TEMPERATURE(Note.10)

HLG-40H-12B STATIC CHARACTERISTICS — STATIC CHARACTERISTICS

HLG-40H-12B TOTAL HARMONIC DISTORTION — TOTAL HARMONIC DISTORTION

HLG-40H-12B MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

HLG-40H-12B ‧tc : Max. Case Temperature — ‧tc : Max. Case Temperature

HLG-40H-12B H L G - 4 0 H series — H L G - 4 0 H series

HLG-40H-12B H L G - 4 0 H series (2) — H L G - 4 0 H series (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

Certificates5

TUV Certificate (HLG-40H)(EN) PDF Download

UL Certificate(HLG-40H)(EN) PDF Download

CB Certificate(HLG-40H)(EN) PDF Download

EMC Certificate(HLG-40H)(EN) PDF Download

PSE Certificate(HLG-40H)(EN) PDF Download

Test reports1

Test Report(HLG-40H-12)(EN) PDF Download

Catalogues1

Mean Well LED Driver Catalog PDF Download

FAQ

Can I use the HLG-40H-12B to dim 12V LED landscape lighting outdoors?

Yes. The HLG-40H-12B delivers 40W at 12V with built-in dimming via 1-10V, PWM, or resistance input, and carries an IP67 waterproof rating. This makes it suitable for outdoor landscape path lights, garden accents, or bollard fixtures where dimming control and weather resistance are both needed.

Is the HLG-40H-12B suitable for powering dimmable 12V LED strips on an outdoor deck?

Yes. Its IP67 rating protects against rain and temporary submersion, and the dimming input lets you adjust brightness for ambient evening lighting on decks, railings, or stair treads. At 40W you can drive a moderate run of 12V strip.

Can the HLG-40H-12B power a 12V LED sign that needs dimming for day-night adjustment?

Yes. The 40W output at 12V is enough for a small 12V sign, and the dimming input lets you reduce brightness at night to avoid light pollution or comply with local ordinances. The IP67 waterproof housing allows outdoor mounting without a separate enclosure.

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

That depends on the strip's power draw per meter. The HLG-40H-12B supplies up to 40W at 12V. A strip rated at 4W/m could run up to 10 meters (40W / 4W per meter = 10m). Always check your strip's rated power per meter and keep total load at or below 40W.

Can the HLG-40H-12B withstand freezing temperatures in a northern outdoor installation?

Yes. Its working case temperature (Tcase) range of -40°C to +80°C means it can start and operate reliably in extreme cold. Combined with the IP67 waterproof enclosure, it handles snow and ice outdoors.

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

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