DTFU is at the forefront of clean area luminaire design featuring unique design solutions to ensure that IP performance is not compromised whatever the ceiling type. Combining robust construction with optical performance, DTFU incorporates the use of edge-lit optics with Nhex-prism diffusing technology to meet the most stringent glare control requirements of EN12464-1.


  • 600mm x 600mm*:
    • 3300 lumens (28W)
    • 4100 lumens (34W glass, 35W prism)
  • 300mm x 1200mm*:
    • 3300 lumens (25W glass, 26W prism)
    • 4100 lumens (32W)
  • 600mm x 1200mm*:
    • 6000 lumens (48W glass, 49W prism)
    • 9000 lumens (72W glass, 76W prism)
  • 4000K colour temperature
  • Nhex-prism optical control provides glare compliance to EN12464-1 as standard
  • All optics are TP(a) rated to limit spread of flame in the event of fire
  • Edge lit technology increases luminaire efficiency as the light source is closer to the optic
  • Optional 4mm toughened glass front face resists all cleaning chemicals
  • Optional Ra≥90 for enhanced examination in healthcare environments

*Notional dimensions


  • Universal installation, suitable for a wide range of modular and prepared aperture ceiling types
  • Extruded aluminium front frame without screws to reduce risk from bacterial contamination
  • LDPE non degradable single piece gasket to protect room from void contamination
  • IP65 to the front, IP54 to the rear
  • Back access and through access available to facilitate maintenance of services located in the ceiling void
  • Through access option has robust suspension mechanism for safe removal and support of frame
  • IP54 ceiling integration retained when front frame removed
  • Solid aluminium side arm jacking brackets for assured ingress protection
  • Suction cup kit required for maintainance (separate order)

600 x 600

Nhex-prism Diffuser Fixed Output 3hr Emergency LL/CW L70 B50
3300 lumens (28W) DLUKH14K DLUKH14KEM ECA 117 >100k 70k 32k
4100 lumen (35W) DLUKH24K DLUKH24KEM ECA 116 >100k 70k 32k

300 x 1200

Nhex-prism Diffuser Fixed Output 3hr Emergency LL/CW L70 B50
3300 lumens (26W) DLUKH34K DLUKH34KEM ECA 127 >100k 70k 32k
4100 lumen (32W) DLUKH44K DLUKH44KEM ECA 127 >100k 70k 32k

600 x 1200

Nhex-prism Diffuser Fixed Output 3hr Emergency LL/CW L70 B50
6000 lumens (49W) DLUKH54K DLUKH54KEM ECA 122 >100k 70k 32k
9000 lumens (76W) DLUKH64K DLUKH64KEM ECA 118 >100k 70k 32k


DTFU Recessing Panel for Spring T 600mm x 600mm DRP600X600
DTFU Recessing Panel for Spring T 300mm x 1200mm DRP300X1200
DTFU Recessing Panel for Spring T 600mm x 1200mm DRP600X1200
Suction Cup Kit * SUCCUP

* Kit includes 2 suction cups


DALI Replace H with Y i.e DLUKY14K
Back Access Add BA to end of code, before Emergency i.e DLUKH14KBA
Through Access ** Add TA to end of code, before Emergency i.e DLUKH54KTA
Glass Change DLUK to DLUG i.e DLUGY14K
Ra90 Add 9 after D i.e D9LUKY14K

** Through access only available on 600mm x 1200mm luminaires

Dimensions Diagram 1
VERSION L W H KG KG(EM) Cut Aperture
600 x 600 598 598 139 12 13 573 x 573*

*Cut Aperture Tolerance +/-3

Dimensions Diagram 2
VERSION L W H KG KG(EM) Cut Aperture
300 x 1200 1198 298 139 12 13 1173 x 273*

*Cut Aperture Tolerance +/-3MM

Dimensions Diagram 3
VERSION L W H KG KG(EM) Cut Aperture
600 x 1200 1198 598 139 23 24 1173 x 573*

*Cut Aperture Tolerance +/-3

Photometic Performance

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

Performance Guide

Performance Guide Diagram 1
  • Lumens: 9000 lumens
  • Average: 1040 lux
  • Maintenance: 0.8

  • Reflectance: 70/50/20
  • Ceiling Height: 3.00m
  • Working plane: 1.00m

LED Performance

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

Recessed LED clean room luminaire for modular or prepared aperture ceilings to a BSI tested and certified construction as IP65 to the front on and IP54 to the rear.  Twin in line extruded aluminium frames with angled integration and a screwless front facia.  TP(a) prismatic diffuser as standard with optional toughened glass optic for maximum resistance to cleaning agents.  Installation via solid aluminium jacking brackets, back access and through access luminaire options to facilitate maintenance including services located in the ceiling void - as Whitecroft Lighting DTFU.

Product Downloads

Select all
  • PDF DTFU Datasheet
  • PDF Clean Area Brochure
  • ZIP Dialux
  • ZIP Relux
  • ZIP Revit
  • 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.