Table 3 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 50 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) | Lamp–sun equivalence (days) | |||
|---|---|---|---|---|
Solar | Lamp | |||
Global | Direct | |||
1. From peak to peak | Day 172 | 2.0 | 280.3 | 140 |
Day 355 | 3.7 | 280.3 | 76 | |
Daily average | 3.2 | 280.3 | 88 | |
2. From sunrise to sunset | Day 172 | 4.0 | 280.3 | 70 |
Day 355 | 5.0 | 280.3 | 56 | |
Daily average | 4.6 | 280.3 | 61 | |
3. First band peak only | Day 172 | 0.5 | 280.3 | 561 |
Day 355 | 0.5 | 280.3 | 561 | |
Daily average | 0.5 | 280.3 | 561 | |