In plant lighting, more and more plant lights are beginning to use UVA and FR730 (or IR730nm).
Are these two spectra really effective for plants?
There are 4pcs FR(IR) LED in this product
There is no actual evidence to show that these four FR(IR) lamps are of practical use. In actual planting, these four FR(IR) lamp beads are replaced with 660nm deep red lamp beads, and the planting effect is not different.
FR(IR) is effective in many papers and experiments. Why is it useless on this kind of lamps? The reason is actually very simple.
If 4 lamp beads are turned on individually, when the floating height is 0.5m, the PPFD is less than 0.2µmol/m²/s, which is almost nothing.
If it is to be effective for plants, it needs at least about 10µmol/m²/s, that is to say, FR(IR), in this product, it has to be increased by 50 times to be useful.
Similarly, if there are only a few UVA lamp beads on a high-power plant lamp, it is claimed to be useful. This is a deceptive behavior, because similarly, a few UVA lamp beads can only provide less than 0.5µmol/m²/ s light.
The amount of UVA added is too small, there is no separate UVA control, it is not recommended to use
So, how to add UVA, and FR(IR) to be useful?
The power of UVA is 35W. In the plant tent, the hanging height is 0.5m, which can provide UVA of about 10µmol/m²/s.
Special attention should be paid to using UVA with caution, even the UVA part of the spectrum.
FR730 (IR730nm), the power is 35W, the suspension height is 0.5m, it can provide FR(IR) close to 10µmol/m²/s
FR (IR) is particularly effective for flowering medicinal plants, but a certain amount is required. Far-red mixed in other spectra, the illuminance of FR cannot be measured alone, that is to say, the PPFD ,The actual effect and usage of FR are doubtful.
Separate UVA and FR (IR) need to be turned on at the right time to have an effect on plant growth. For example, turn on FR (IR) during the flowering period,or turn on FR (IR) when night falls to simulate sunset.
Some plant lights add a small amount of UVA and far-red infrared light, which is of no practical use to plants. Maybe the only benefit is to give people comfort
Separate UVA channel and far-red light FR channel are generally effective.
The following plant light is a single ultraviolet light UVA channel. This amount should be effective and should be used with caution not to have adverse effects.
UVA accounts for a large proportion and should be effective. In the case of scenes where UVA is not used, UVA can be turned off without causing adverse consequences.
The plant light below is a separate FR (IR) channel, and the light should be sufficient
Enough far red light FR730 (infrared light IR730nm), independent channel, please turn on during the flowering period
FR (IR), the power is about 50W, the PPFD provided is about 10µmol/m²/s, and the height of the suspension is about 0.6m.
to sum up:
UVA, experiments have proved that it is effective for leafy vegetables, but the illuminance of this spectrum should not be too high or too low. For example, just adding a few UVA will not have any effect. For general leafy vegetable cultivation, add UVA of about 10µmol/m²/s in the middle and late stages. However, UVA is harmful to many plants, especially in the seedling stage. Pay attention to use; in fact, very small UVA, such as UVA less than 0.5µmol/m²/s, has no effect on plants, and of course it has no great harm. Can achieve the effect of placebo.
FR(IR), during the flowering period, can stimulate the flowering of crops and increase the yield. Of course, FR(IR) less than 5µmol/m²/s does not have much effect.
The above is for reference only, not as a basis for planting.