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Table 2 Comparison between the daily solar radiant exposure in São Paulo (SP), Brazil, and the radiant exposure provided by the lamp over a 50-h period (distance between sunglasses and lamp is 300 mm) for 2 specific days of the year: the shortest (day 172) and longest (day 355) days

From: Equivalence between solar irradiance and solar simulators in aging tests of sunglasses

 

Radiant exposure (MJ m−2)

Photoperiod (h)

Lamp–sun equivalence (days)

Solar

Lamp

Direct

Diffuse

Global

Direct

From peak to peak

 Day 172

1.5

0.5

2.0

7.8

4.0

4

 Day 355

2.3

1.4

3.7

7.8

8.6

2

 Daily average

2.1

1.0

3.2

7.8

6.9

2

 Lamp

    

50.0

 

From sunrise to sunset

 Day 172

3.0

1.0

4.0

7.8

10.7

2

 Day 355

3.3

1.7

5.0

7.8

13.6

2

 Daily average

3.2

1.4

4.6

7.8

12.1

2

 Lamp

    

50.0

 

First band peak only

 Day 172

0.4

0.1

0.5

7.8

1.0

16

 Day 355

0.4

0.1

0.5

7.8

1.0

16

 Daily average

0.4

0.1

0.5

7.8

1.0

16

 Lamp

    

50.0

 
  1. In addition, the daily average is shown