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. 2021 Feb 26;12:611236. doi: 10.3389/fpls.2021.611236

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Copyright © 2021 Dannehl, Schwend, Veit and Schmidt.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Normalized difference vegetation index (NDVI) and electron transport rate (ETR) of tomato leaves exposed to LEDs and HPS lighting. Data represent mean values of three repetitions in three consecutive weeks (n = 3). NDVI and ETR were tested using student’s t-tests. Different small letters illustrate significant differences (p < 0.05).