Table 3.
Detail of the characteristics of the light treatments under which the ‘Levistro’ lettuce plants were grown for 28 days.
| Light | Spectrum Blue:Green:Red:Far-Red | Red:Blue Ratio (R:B) |
DLI 1 | PAR 2 |
|---|---|---|---|---|
| mol m−2 day−1 | µmol m−2 s−1 | |||
| Blue (B) | 47:22:21:10 | 0.5:1 | 9.4 ± 1.1 | 331 ± 26 |
| White (W) | 30:38:23:9 | 0.8:1 | 9.1 ± 1.0 | 330 ± 25 |
| Blue-Red (BR) | 33:15:44:8 | 1.3:1 | 9.5 ± 1.1 | 336 ± 20 |
| Red (R) | 16:16:60:8 | 3.8:1 | 9.6 ± 1.1 | 328 ± 24 |
| Control (ambient light) | 25:30:31:14 | 1.2:1 | 16.9 ± 1.9 | 702 ± 126 |
1 Daily light integral (DLI) under each treatment in which ambient light was enriched with different light spectra for 28 days. 2 Average photosynthetically active radiation measured at midday during the 28 days that lettuce plants were grown under the different light treatments.