Because TSL2000 is white color full-spectrum light, White light has more blue than red light in the spectrum. So we put some red light in the light. In fact, the present spectrum is suitable for the growth of plants, whether they are flowering or growing stage. So you don't have to add a red light. But if you want something better, you can add it
I drove an arrow in the picture where I see the ratio in colors. Blue has 2.2% but the highest peak in the spectrum? In another picture visually it doesn't take that much space on the surface with all colors and CCT 3610°K.
I'm not sure if I understand it's equality to red or far red but I have found that red and far red works great together to achieve Emerson effect. I will leave picture below.
Blue light works opposite, doesn't let cells to stretch but open stomata for co2 intake and water outtake control.
That's why under hps light you have no control in stretching, plants can go insane big. I even sow an autoflower that yilded 1kg+ dry bud
using HPS light that doesn't almost have blue light in contast.
Here is the video if someone is interested to see:
For example someone likes scrog and obviously they want to fill all space horizontally, all that stretching would be much yeasier to achieve in shortest time or with less plants for example with small amount of blue light and higher level of red and far red. Some green is also important , but blue isn't so important if you want to have big plants.
Also plants are searching for blue light to stretch upwards to sun, but if blue light is more intensive then other colours it should not let plants to stretch upwards, in my opinion it also stun the growth if there is only blue light for example.
Ps. I'm not saying blue light it's not necessary I just want to understand it's equality to red and far red to adjust the spectrum contrast if it's necessary to achieve faster growth.
If I understand something wrong hopefully someone will help to understand it better.
Thanks
