luxloop - photonstar lighting - lg7 and ugr1… · copyright photonstar led group plc. 2015 luxloop...

Copyright PhotonStar LED Group Plc. 2015

LuxLoop

Meeting UGR19 and LG7


What is LG7 and UGR19?

LG7 is the guide issued by the Society of Light and Lighting (under CIBSE)

covering lighting design for offices. The guide highlights the need for glare

control and good luminance balance across the main surfaces of the

room. This has resulted in LG7 being reduced to its main recommended

ratios of 50:30:20 for walls:ceiling:floor.

UGR is an approximate model that expresses the chance of direct glare

by a luminaire, the higher the figure, the greater the chance of glare.

Example of office area where the requirement of UGR limit is 19 then

the value should not exceed 19; it could be lower or equal to 19.

UGR19 is the maximum permissible value for offices.


The Challenge

To meet both UGR19 and LG7 in an open office. We used three

standard office layouts and compared our LuxLoop fitting

versus a traditional T5 Fitting with a Cat 2 Louvre.

LuxLoop T5 with Cat 2 Louvre

Layout 1 = 12m x 5m open office with 16 fittings designed to 500 lux average



Corridor = 20m x 2m open corridor with 4 fittings designed to 100 lux average

Vs. Tier 1 Manufacturer

LED Panel Vs.


Layout 1 - LG7 & UGR19 Comparison

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Walls Ceiling Floor

LuxLoop

T5 Fitting

Tier 1 LED Panel

LG7

Requirement

Walls

LG7

Requirement

Ceiling

LG7

Requirement

Floor

0123456789

1011121314151617181920

North

Calc.

Point

West

Calc.

Point

East

Calc.

Point

South

Calc.

Point

LuxLoop

T5 Fitting

Tier 1 LED

Panel

UGR19

LG7 UGR19

LuxLoop complies with both LG7 and UGR19

T5 Fitting only complies with UGR19, not LG7

Tier 1 LED Panel doesn’t comply with either

12m x 5m open office designed to 500 lux average


Layout 2 – LG7 & UGR19 Comparison

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Walls Ceiling Floor

LuxLoop

T5 Fitting

Tier 1 LED Panel

LG7

Requirement

Walls

LG7

Requirement

Ceiling

LG7

Requirement

Floor 0123456789

1011121314151617181920

North Calc. Point East Calc. Point

LuxLoop

T5 Fitting

Tier 1 LED

Panel

UGR19

LG7 UGR19



Tier 1 LED Panel only complies with UGR19, not LG7



Layout 3 – LG7 & UGR19 Comparison

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Walls Ceiling Floor

LuxLoop

T5 Fitting

Tier 1 LED Panel

LG7 Requirement

Walls

LG7 Requirement

Ceiling

LG7 Requirement

Floor 0123456789

1011121314151617181920

North

Calc.

Point

West

Calc.

Point

East Calc.

Point

South

Calc.

Point

LuxLoop

T5

Fitting

Tier 1

LED

Panel

LG7 UGR19






Corridor – LG7 & UGR19 Comparison

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Walls Ceiling Floor

LuxLoop

T5 Fitting

Tier 1 LED Panel

LG7 Requirement

Walls

LG7 Requirement

Ceiling

LG7 Requirement

Floor

2m x 20m corridor designed to 100 lux average

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Calc. Point 1 Calc. Point 2

LuxLoop

T5 Fitting

Tier 1 LED

Panel

UGR19

LG7 UGR19





LG7 Office Layout Diagrams

5m

12m

Layout 1

Average Lux:

Workplane: 527

Floor: 439

Ceiling: 185

Walls (4): 310

4m

6m

Layout 2

Average Lux:

Workplane: 503

Floor: 385

Ceiling: 188

Walls (4): 288

4m

15m

Layout 3

Average Lux:

Workplane: 564

Floor: 465

Ceiling: 210

Walls (4): 340



Layout 1

Average Lux:

Workplane: 449

Floor: 419

Ceiling: 99

Walls (4): 194

Layout 2

Average Lux:

Workplane: 443

Floor: 343

Ceiling: 86

Walls (4): 170

Layout 3

Average Lux:

Workplane: 535

Floor: 446

Ceiling: 110

Walls (4): 221

5m

12m

4m

6m

4m

15m



Layout 1

Average Lux:

Workplane: 494

Floor: 468

Ceiling: 147

Walls (4): 316

Layout 2

Average Lux:

Workplane: 536

Floor: 411

Ceiling: 152

Walls (4): 304

Layout 3

Average Lux:

Workplane: 611

Floor: 505

Ceiling: 167

Walls (4): 352

4m

6m

4m

15m

5m

12m


LG7 Corridor Layout Diagram

Corridor

Average Lux:

Workplane: 118

Floor: 114

Ceiling: 65

Walls (4): 91

Corridor

Average Lux:

Workplane: 111

Floor: 109

Ceiling: 34

Walls (4): 68

Corridor

Average Lux:

Workplane: 144

Floor: 139

Ceiling: 58

Walls (4): 107

2m

20m

2m

20m

2m

20m


UGR19 Office Layout Diagrams

Layout 1

UGR19 Values:

Calculation Point 1: 12




Layout 2

UGR19 Values:



Layout 3

UGR19 Values:





5m

12m

4m

6m

4m

15m



Layout 1

UGR19 Values:





Layout 2

UGR19 Values:



Layout 3

UGR19 Values:





5m

12m

4m

6m

4m

15m


UGR19 Corridor Layout Diagram

2m

20m

2m

20m

2m

20m

Layout 1

UGR19 Values:



Layout 2

UGR19 Values:



Layout 3

UGR19 Values:



luxloop - photonstar lighting - lg7 and ugr1… · copyright photonstar led group plc. 2015 luxloop...

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