GLL4U Series of ActiveLED® Linear Grow Light fixtures, from 288W up to 640 Watt

  • GLL4 Series of ActiveLED® Linear Grow Lighting, up to 680 Watt fixtures for any indoor fully artificial or extended day lighting application - see table for details

  • Lumen Lifetime of 90,000 hours (90% Luminous Flux)

  • Approximate PAR output equivalence - see table for details

  • Easy replacement for conventional Fluorescent and Metal Halide High Bay light fittings

  • ActiveLED® - Environmentally Safe Lighting:
    • Zero mercury content
    • Eliminates disposal of
    hazardous materials
    • Made in USA - local support

  • LG4U Series fixtures include support for the ActiveLED Digital Management to allow on/off and dimming profiles to be enforced.
    Optional ActiveLED controls for additional energy savings:
    • Daylight Sensor
    • Digital Rotary Dimmer
    • LightSpace Management
    • Battery Backup for
    emergency lighting

  • About half the height of traditional HID fixtures minimizes the required vertical installation space

    Less than half the weight (22 lbs) reduces the cost of the supporting structure.

  • Choice in all models of CCT color temperatures - 4000K or 5000K.

    LUM-INTENSETM by ActiveLED® is a new LED luminaire lighting technology that provides more light (more lumens per Watt) - punches an intense amount of light out of a smaller package.

GLL4 Series of ActiveLED® Linear Grow Light fixtures, from 288W up to 640 Watt fixtures for any indoor plant and produce growing environment.

New generation grow lights combine state-of-the-art LED, electronic and mechanical design, choice of 288, 420W or 640 Watt models for indoor grow applications

The ActiveLED® GLL4 Series Linear Grow Lighting consumes at least 50-85 percent less energy than conventional lighting and additional energy savings can be achieved with the reduced need for air-conditioning.

With its patented design and superior LED elements, the ActiveLED GLL4 Linear Grow Light is a reliable light source with a 90,000-hour lumen life, making it a maintenance-free solution for applications where changing bulbs and ballasts can be hazardous and expensive.

PAR Expectations (approximations may change with environment)

Fixture Type 6 fixtures in 5' grid single fixtures in 10' x 10'
cubical with white walls
288W ~750 PAR ~500 PAR
300W ~780 PAR ~520 PAR
420W ~1100 PAR ~729 PAR
600W ~1500 PAR ~1050 PAR
680W ~1750 PAR ~1180 PAR
Note: GLL4U grow light PAR is measured 24" below light emitters in 5' x 5' grid, or at 18" for single light with a CCT of 4000K.

Significant savings from not having to maintain and renew ballasts and HID lamps, as well as significantly reduced heat generation and energy use justify the initial outlay.

ActiveLED® GLL4 Series Product Overview

Ringdale provides a comprehensive range of ActiveLED GL4 Linear Grow Light Fixtures with different wattages for varying applications, all available in a choice of CCT color temperatures - 4000K and 5000K.
All GL4 fixtures include support for the ActiveLED Digital Management capability plus optional support for optional Battery Back-Up (BBU):

Product Code


Fixture Watt

Light Output(lm)

Height above Canopy


Lettuce, Early Stages

288 Watt

43,200 lm @ 4000K

12 to 24" above


Tomato, Second Stage

420 Watt

64,500 lm @ 4000K

12 to 24" above


Tulips, Final Stage

680 Watt

104,000 lm @ 4000K

24 to 36" above

ActiveLED® Technology

Ringdale uses the latest in energy efficient LEDs and LED Modules producing equal or greater light output than HID light fixtures. Our state-of-the-art electronics monitor current and temperature of the electronics substrate to assure maximum performance under the prevailing environmental conditions and a Lumen Lifetime of 90,000 hours (90% Luminous Flux).

ActiveLED® Diffuser Technology

We use state-of-the-art diffuser technology with a minimal amount of light loss in the fixture providing for maximum lighting efficiency.

ActiveLED® Architectural Features

ActiveLED Grow Lights are half the height of a conventional grow light fixture and less than half the weight, putting less stress on the structure.

ActiveLED® Warranties

We provide mechanically robust indoor and outdoor lighting systems; our warranties are 10 years on LED elements, fixtures and drivers / power supplies.

Ringdale is an ISO 9001:2015 company. Ringdale provides products of the highest quality designed and manufactured in Texas, USA and in the United Kingdom.

ActiveLED® OL4-SM Sample Part Numbers:

GLL4U-S-K50R288WH, 288 Watt CCT5000K, White
GLL4U-S-K50R420WH, 420 Watt CCT5000K, White
GLL4U-S-K50R680WH, 680 Watt CCT5000K, White

Technical Information

Input Voltage:• 288W model: Auto-sensing 100..277 Volts AC, 50/60 Hz
• Digital Power Source, dedicated circuit strongly recommended
• 300W..640W models: Auto-sensing 208V..277V 50/60Hz
Power Statistics:Dependent upon fixture model:
• 288 W, 300W, 420W, 600W and 640W versions
CCT Color Temperatures:Choice of 4000K and 5000K, in accordance with ANSI C78.377A
Operating Temperature:-58° F to +149° F (-50° to +65° C)
Mounting:Suspended by four Eyelets from underneath the ceiling / roof structure
or pendant mount option
Fixture Dimensions:

19.29" x 47.75" (49.0 x 121.3 cm)

5.12" (13.0cm)
Weight:22.5 lb (10.2 Kg)
Listings and Tests:cUL listed driver, CE, suitable for interior locations.
RoHS compliant. IP61 Rated optical assembly.
LM-79 and LM-80 info available.
Conforms to FCC Part 15.19 Subpart B Class A.
Made in USA - ARRA Compliant.

Caution! All specifications published herein are subject to change without notice. See website for Terms and Conditions of use of the website and the information provided herein. See Ringdale website on for Terms and Condtions of Sale and Service.

+44 (0)844 264 1570