Sure, by now we are all aware that LED grow light does wonderful things for plant growth. Plants grow quicker and healthier than under other, traditional lighting methods such as HPS. If the LEDs are good, plants can grow even better than under natural sunlight. Ali zašto su uvijek ljubičaste/ružičaste?
All light sources contain a spectrum of colors within it – some light sources contain some of the colors, some contain all. Sunlight contains all spectrum colors and because of that feeds plants with all information they need. Additionally, because of the presence of all spectrum colors, it appears color-free to human eyes.
Prilikom izrade LED svjetiljke možemo odlučiti koje LED čipove u boji staviti unutra. To ovisi o tome kakav odgovor želimo postići od biljaka. Na primjer, ako želimo da biljke rastu, povećat ćemo količinu daleko-crvenih, žutih, narančastih i zelenih čipsa unutar svjetiljke. Ako želimo da biljke budu kompaktne, stavit ćemo više čipsa plave ili UV boje.
Why plants respond in those ways to those particular colors is a broad topic. It is something that we will cover in a separate post. Either way, these responses are encoded in plants' DNA. So, when designing LED lamps, we can count on plants responding the way nature has designed them to.
We could say that the two most important light colors to place in an LED lamp are: Crvena and plava. Crvena je glavna komponenta koja je biljkama potrebna za fotosintezu i inhibiciju produljenja stabljike. Osim toga, biljkama signalizira da iznad njega nema drugih biljaka i da se tako može nesputano razvijati. Plava stimulira otvaranje stomata, inhibiciju produljenja stabljike, širenje listova, zakrivljenost prema svjetlu i fotoperiodično cvjetanje.
The combination of these two sets of effects will, in simple terms, get the plant from seed to the vegetative stage and eventually to flowering. This however will be much slower than under continuous spectra a.k.a spectra that contain more than just red and blue.
Dodavanje nekih drugih boja spektra kao što je zelena, moglo bi povećati brzinu širenja listova i produljenje stabljike, što zauzvrat rezultira većom akumulacijom biomase (prinosa). Dodavanjem UV valnih duljina može se utjecati na nakupljanje spojeva kao što su fenoli koji bi mogli pojačati okus krajnjeg proizvoda ili njegove zdravstvene prednosti za ljude.
