Mean Well HLG-120H-42 Power Supply

Name: Mean Well HLG-120H-42 Power Supply 120W 42V 2.9A
Brand: Mean Well
SKU: HLG-120H-42
Price: 52.7 USD
Availability: InStock
Rating: 5.0 (4 reviews)

Overview

HLG-120H-42 is the 42V output model of this series: rated current 2.9A, rated power 121.8W, typical efficiency 93%. Type Blank: Io and Vo fixed (IP67).

HLG-120H series is a 120W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-120H operates from 90～305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 93.5%, 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. HLG-120H 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
IP67 rating for indoor or outdoor installations
Typical lifetime > 62000 hours
7 years warranty

Specifications

HLG-120H-42Specifications from the official datasheet (2026-07-24 edition)

OUTPUT

DC VOLTAGE: 42V
CONSTANT CURRENT REGION^Note.4: 21 ~ 42V
RATED CURRENT: 2.9A
RATED POWER: 121.8W
RIPPLE & NOISE (max.)^Note.2: 200mVp-p
VOLTAGE ADJ. RANGE: 38 ~ 46V
CURRENT ADJ. RANGE: 1.4 ~ 2.9A
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME^Note.6: 1200ms,50ms/115VAC 500ms,50ms/230VAC
HOLD UP TIME (Typ.): 12ms / 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≧0.93/277VAC @ full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION: THD< 20% (@ load≧50% / 115VAC,230VAC; @ load≧75% / 277VAC) (Please refer to " TOTAL HARMONIC DISTORTION (THD) " section)
EFFICIENCY (Typ.): 93%
AC CURRENT (Typ.): 1.4A / 115VAC 0.6A / 230VAC 0.55A / 277VAC
INRUSH CURRENT (Typ.): COLD START 60A(twidth=375μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
MAX. No. of PSUs on 16A CIRCUIT BREAKER: 5 units (circuit breaker of type B) / 9 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: Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 47 ~ 53V Shut down o/p voltage with auto-recovery or re-power on to recovery
OVER TEMPERATURE^Note.9: Shut down o/p voltage, recovers automatically after temperature goes down

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 61347-1, BS EN/EN 61347-2-13, AS/NZS 61347-1, AS/NZS 61347-2-13 independent; GB/T19510.1,GB/T19510.213, IP67, J61347-1, J61347-2-13 ,BIS IS15885( for 12B,24B,36A,54A only), EAC TP TC 004 , KC61347-1,KC61347-2-13 approved
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/EN55032 Class B, BS EN/EN61000-3-2 Class C (@ load≧50%) ; BS EN/EN61000-3-3, GB/T 17743 , GB17625.1, EAC TP TC 020, KSC 9815(except for D-type)
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),EAC TP TC 020, KSC 9547(except for D-type)

OTHERS

MTBF: 2185.8K hrs min. Telcordia SR-332 (Bellcore); 167.1Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 220*68*38.8mm (L*W*H)
PACKING: 1.12Kg; 12pcs/14.4Kg/0.8CUFT

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 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. For OTP which triggered at light load/no load condition, proceed AC repower on to recovery.
10. 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.
11. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com
12. 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).
13. 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
15. 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-120H-42 BLOCK DIAGRAM — BLOCK DIAGRAM

HLG-120H-42 Illustration (page 5) — Illustration (page 5)

HLG-120H-42 STATIC CHARACTERISTICS — STATIC CHARACTERISTICS

HLG-120H-42 TOTAL HARMONIC DISTORTION — TOTAL HARMONIC DISTORTION

HLG-120H-42 MECHANICAL SPECIFICATION ※Blank/D-Type — MECHANICAL SPECIFICATION ※Blank/D-Type

HLG-120H-42 ‧tc : Max. Case Temperature — ‧tc : Max. Case Temperature

HLG-120H-42 Dimensions (mm) — Dimensions (mm)

HLG-120H-42 WATERPROOF CONNECTION — WATERPROOF CONNECTION

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

Datasheet1

HLG-120H-42 datasheetHLG-120H-SPEC.PDF · 2026-07-24 edition PDF Download

Certificates5

UL Certificate (HLG-120H)(EN) PDF Download

TUV Certificate (HLG-120H)(EN) PDF Download

EMC Certificate (HLG-120H)(EN) PDF Download

PSE Certificate (HLG-120H)(EN) PDF Download

ENEC Certificate(HLG-120H)(EN) PDF Download

Catalogues1

Mean Well LED Driver Catalog PDF Download

FAQ

Can I use the HLG-120H-42 to power 42V LED panel lights in a commercial ceiling?

Yes. The HLG-120H-42 delivers 42V at up to 2.9A (121.8W), which is well matched to 42V LED panel lights and troffers commonly used in office and commercial ceilings. The 90-305VAC input supports worldwide mains voltages, and the MTBF of 2185.8K hours (Telcordia SR-332) suits long-term commercial installations.

Is the HLG-120H-42 suitable for powering 42V LED high-bay fixtures in a warehouse?

Yes. At 121.8W and 42V constant-current output, the HLG-120H-42 can drive medium-wattage 42V high-bay luminaires. The IP67 waterproof rating and metal housing allow installation in dusty or damp warehouse environments, and the -40°C to +80°C case temperature (Tcase) rating covers unheated facilities.

Can the HLG-120H-42 drive outdoor 42V LED flood lights or area lights?

Yes. The IP67 waterproof rating protects the driver from rain, snow, and dust, making it suitable for outdoor flood light and area light applications. The 121.8W output at 42V provides enough power for medium-intensity 42V LED flood fixtures, and the wide case temperature range handles seasonal extremes.

How many meters of 42V LED strip can the HLG-120H-42 support?

Divide the 121.8W rated power by your strip's rated power per meter. For instance, a 42V strip drawing 15W/m could be run up to about 8 meters (121.8W / 15W per meter = 8.1m). Always check your strip's specifications and keep the total load at or below 121.8W.

Can the HLG-120H-42 operate in an unheated outdoor enclosure during winter?

Yes. The HLG-120H-42 is rated for a case temperature (Tcase) of -40°C to +80°C, so it handles sub-zero winter conditions without issue. The IP67 waterproof rating also protects against water from ice melt or precipitation inside an outdoor enclosure.

What are the differences between the HLG-120H-42, 42A, 42AB, and 42B variants?

All four share the same 121.8W / 42V / 2.9A core specs and CC voltage range of 21-42V. The base HLG-120H-42 has fixed output and IP67 waterproof rating. The -42A adds output voltage/current adjustment via built-in potentiometer (IP65). The -42AB adds both adjustment and 1-10V/PWM dimming input (IP65). The -42B offers dimming input only and retains IP67 waterproof rating.

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Customer reviews

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Reviewed by 4 customers across the HLG series

By Penny C.|2026-10-03✓ Verified Buyer
Model: HLG-480H-24AQuantity: 2
It is a beast!
By T-Rids |2026-09-14✓ Verified Buyer
Model: HLG-480H-24BQuantity: 1
Very good product
By Maxim|2026-08-25✓ Verified Buyer
Model: HLG-320H-24B ×1, HLG-320H-24B ×1Quantity: 1
Excellent product!
By J. Vega|2026-07-20✓ Verified Buyer
Model: HLG-185H-30Quantity: 1
Exactly what I needed to revive my dead Maytronics Dolphin power supply!

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Mean Well HLG-120H-42 Power Supply 120W 42V 2.9A

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