Combining robust construction with optical performance, Lister is easy to clean, maintains room integrity to a high IP rating and incorporates the use of edge-lit optics with Nhex-prism diffusing technology for all round visual comfort. 


  • 600mm x 600mm* 
    • 3300 lumens (28W)
    • 4100 lumens (35W)
  • 300mm x 1200mm* 
    • 3300 lumens (26W)
    • 4100 lumens (32W)
  • 600mm x 1200mm* 
    • 6000 lumens (49W, 51W for opal)
    • 9000 lumens (76W, 77W for opal)
  • TP(a) optics to limit spread of flame in the event of fire
  • Choice of optics:
    • Nhex-prism optical control for glare compliant schemes to EN12464-1
    • Opal polycarbonate diffuser for non VDT, general and circulation areas
  • Available with 3000K and 4000K LED

* Notional dimensions


  • Extruded aluminium front frame with concealed fixings
  • LDPE non degradable single piece gasket to protect room from void contamination
  • IP65 to the front, IP20 to the rear
  • Compatible with modular exposed T25, spring T and prepared aperture ceilings
  • Recessing panels are recommended on spring T ceilings to retain room integrity
  • Optional Lumafix brackets available as an accessory for cut aperture and alternative ceiling types


600 x 600

Nhex-prism (4000K) Fixed Output 3hr Emergency LL/CW L70 B50
3300 lumens (28W) L3LKH14K L3LKH14KEM ECA 117 >100k 70k 32k
4100 lumens (35W) L3LKH24K L3LKH24KEM ECA 116 >100k 70k 32k

300 x 1200

Nhex-prism (4000K) Fixed Output 3hr Emergency LL/CW L70 B50
3300 lumens (26W) L3LKH34K L3LKH34KEM 127 >100k 70k 32k
4100 lumens (32W) L3LKH44K L3LKH44KEM 127 >100k 70k 32k

600 x 1200

Nhex-prism (4000K) Fixed Output 3hr Emergency LL/CW L70 B50
6000 lumens (49W) L3LKH54K L3LKH54KEM 122 >100k 70k 32k
9000 lumens (76W) L3LKH64K L3LKH64KEM 118 >100k 70k 32k


DALI Replace H with Y i.e L3LKY14K
COMEPS Add suffix EP i.e L3LKH14KEP
Opal Diffuser Replace L3LK with L3LF i.e L3LFH14K

For 3000K colour temperature, please contact Whitecroft.


Lister Recessing Panel for Spring T 600mm x 600mm DRP600X600
Lister Recessing Panel for Spring T 300mm x 1200mm DRP300X1200
Lister Recessing Panel for Spring T 600mm x 1200mm DRP600X1200
Lumafix Bracket Kit LUMAFIXBKTKIT
Dimensions Diagram 1
Size L W H KG KG(EM) Cut Aperture
600 x 600 598 598 109 9 9.5 563 x 563 +/-3
Dimensions Diagram 2
Size L W H KG KG(EM) Cut Aperture
600 x 1200 1198 598 108 12 13.5 563 x 1163 +/-3
Dimensions Diagram 3
Size L W H KG KG(EM) Cut Aperture
300 x 1200 1197.7 297.7 108.3 6 6.5 263 x 1163 +/-3

Photometic Performance

Photometic Performance Diagram - Lister 600mm x 600mm
Lister 600mm x 600mm
LOR = 100%
SHR MAX = 1.52
Photometic Performance Diagram - Lister 600mm x 1200mm
Lister 600mm x 1200mm
LOR = 100%
SHR MAX = 1.56

Performance Guide

Performance Guide Diagram 1
  • Lumens: 4145 lumens
  • Layout: 3.0x2.4m
  • Average: 516 lux

  • Uniformity: 0.89
  • Ceiling Height: 2.70m
  • Working Plane: 0.75m
  • Maintenance Factor: 0.8
  • Reflectance: 70/50/20

LED Performance

Colour Temp RA (CRI) Colour consistency
4000K >80 MacAdam 3 SDCM

Recessed LED clean room luminaire to a BSI tested and certified construction as IP65 to the front, IP20 to the rear.  Extruded aluminium frame with concealed front fixings and a choice of TP(a) rated optics - wipe clean Nhex-prism diffuser for all round glare control or an opal diffuser for general use areas - as Whitecroft Lighting LISTER. 


Product Downloads

Select all
  • PDF Lister Datasheet
  • PDF Clean Area Brochure
  • ZIP Revit
  • ZIP Relux
  • ZIP Dialux
  • PDF Installation Leaflet
  • PDF Recessing Panel Installation Leaflet
  • PDF Thermoplastic Lighting Diffusers
  • PDF LED Maintenance Factors
  • PDF Ceiling Compatibility Matrix

At Whitecroft, we have developed the Whitecroft Lighting Academy, a structured learning programme that will allow us to develop our future leaders, and ensure all of our staff have access to the best professional development opportunities available in our industry.

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At Whitecroft, our BIM engineers are not only adept at using Autodesk Revit; they are also fully trained lighting designers. We believe this is essential. When you use our teams on your project, you can rest assured the whole lighting solution is being designed, assessed and managed by people who know the technology inside out and have a full understanding of your requirements.

- We can populate your BIM model with a full lighting design.

- All our BIM families are created in-house, so if bespoke models are required, we can deliver them.

- We use Relux to create design validation data that confirms your project’s compliance and supports your BIM model.

- Once the model is complete, we work with you to interrogate every element including quantity schedules, costs, energy validation, COBie data and delivery schedules.

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Whitecroft have become successful in the lighting market, with focus on various sector specialisms. We now have extended our skills by offering a fully managed service which supplies much more than just the luminaires.

Project Management skills have been developed to save time on a project by planning it out and considering all relevant factors which may affect its outcome.

From design to specification, through to product selection, commissioning and after-sales support, we can help our customers meet the cost challenges of the commercial environment.

Our Project Management services encourage a smooth transition throughout your lighting procurement, manufacture, delivery and installation, by providing advice on the best techniques to employ.


Whitecroft Lighting continuously strives to offer customers the best service in the industry. This covers all aspects of our service from lighting design and quotations, to ensuring on-time deliveries and providing dedicated project management.

Whitecroft Lighting operates in a sustainable way by creating lighting solutions best adapted to customer requirements, with the least possible impact on the environment including consumption of natural resources. Whitecroft Lighting contributes to and takes responsibility for the furtherment of sustainability, which it also requires of all suppliers in it’s chain.

Through our environmental management system we are continually reducing our use of natural resources, whilst optimising recycled materials, avoiding waste generation and increasing recycling. As a responsible manufacturer we carry our company values and policies into our supply chain so that our customers can have confidence in the fact that all our lighting solutions are manufactured using only environmentally safe materials and processes.