sunlight. burning led

I have 9 baby seedling range from 2 weeks to 3 weeks old . I would post a picture of my ladies in a hour or so from this post . But , i am not sure of why my plants curled up like it’s sun burned or looks as if it’s nutrients burn . I waited until the 3rd week to feed them the nutrients as it...

Hi. I have from my work a calibrated laser power meter, the sensor is an photoelement square 1 cm. The meter reads directly the Watt of the light. To measure you must first select the freqency. From 300 to 1000nm you can select any frequency you want. You can NOT select a range. When the sun...