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
| 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 | |
In addition, the daily average is shown