While the lumens measurement is based on the sensitivity of the human eye to light, PAR Watts objectively measure the total watts of Photosynthetically Active Radiation (PAR) emitted by the lamp. It accounts for the nutritional value and is a direct measure of light energy available for all-important plant photosynthesis.
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| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Lighting Information (PAR, PPFD, umol/s, DIL) | 24 | 5153 | July 20, 2021 | |
| Minimum/Maximum Light requirements Umol/s, PPFD or PAR | 2 | 2139 | October 16, 2017 | |
| LED lighting compared to 1000 watt MH | 44 | 2688 | June 13, 2019 | |
| 50 watts per square? | 9 | 559 | October 29, 2018 | |
| Starting light ppfd | 4 | 285 | May 21, 2022 | |
| Too much light | 9 | 393 | June 6, 2022 | |
| Light or PAR meter? | 23 | 881 | October 3, 2020 |