Why don´t you specify lumens output for your horticulture LED lights?
Lumens are a measure for light perception by the human eye. Thus the measurement units lumens and lux (lumens per area) are inappropriate for comparing grow lights. Consequently we will state the figures for photosynthetically active radiation (PAR). The corresponding measures are PPF and PPFD (PPF per area).
More info on measurement units will follow.
What is the recommended distance to the canopy?
We basically recommend to leave at least 8″ (20 cm) distance between canopy and lighting fixtures.
For mid power LEDs running at low currents this distance may fall short in exceptional cases (e.g. late flowering, if there is no more space to the top of the chamber).
How many LED modules will I need to replace my HPS light?
There are two approaches to get an estimation.
- Compare power consumption as a rule of thumb:
Modern LEDs are much more efficient than HPS. In case of our FLUXengines even 40 % more efficient. And as there are additional benefits of LED lighting, e.g. better distribution of photons over the canopy, energy savings would tend towards 50%.Resulting in this rule of thumb for the FLUXengines:
250 W HPS → 2 x FLUXengine @ 3000 mA
400 W HPS → 4 x FLUXengine @ 2500 mA
600 W HPS → 6 x FLUXengine @ 2500 mA
1000 W HPS → 10 x FLUXengine @ 2500 mA
But still – the more LED modules, the better! The more FLUXengines you operate, the lower the drive current you can operate the fixture with. Consequently the LEDs will run even more efficient. That will be saving you money in the long term.
- PAR-Output and PPFD-Map
A more accurate approach is to compare PAR-outputs of different lights. Additionally, the distribution of light plays an important role. We will publish another article on this soon, in the meantime please consider the efficiency of up to 3.0 PPF/W or test the FLUXengine yourself!
How to wire the FLUXengines?
Generally we recommend series wiring. You will find wiring schemes here.
Using parallel wiring there can be undesired side effects caused by tiny differences between individual FLUXengines, e.g. delayed switch on etc. Nevertheless in many setups you will prefer parallel wiring. Just take into account the above effects.
Which driver should I choose for my DIY project?
Which thermal management should I use for my setup?
First of all, you should pay attention to internal air circulation in your cultivation area, in order to effectively remove excess heat from the LED fixture.
Generally speaking: the better the cooling, the more efficient the LEDs will operate and the longer their life expectancy.
Thus theoretically the heatsink should be chosen as large as possible and be combined with a high throughput fan in order to remove excess heat from the heatsink. In practice though, you will have to consider how much efford you are willing to throw in and at what budget. In many cases, also space and avoiding noise will play an important role.
Our plug-and-play solutions come with passive cooling that ensures compliant operation within normal environments. Additionally, smart sensors keep track and protect the fixture in case the permissible temperatures are exceeded.
For our DIY products we would recommend to always use heat sinks. We have gathered test data for you to evaluate when planning your thermal management.
What is the best spectrum (or color temperature)?
A simple recommendation will lead nowhere on this topic. The light spectrum and also the color temperature largely influence – besides photosynthesis – growing behavior and characteristics of plants (photomorphogenesis).
Cold white light (higher blue ratio,4000 K and above) is beneficial for vegetative stages of plant development and particularly promotes compact growth which is desired in indoor growing environments. Too warm light tamperatures would lead to stretching plants.
Warm white light (higher red ratio, 3000 K and below) is beneficial for fruit and flower stages of plant development. This phase will require very high photon intensities – red light contains more photons.
Neutral white light (balanced red and blue ratio, 3500 K) is a true allrounder suitable for all development stages of plants. You won´t chose wrong when you chose 3500 K lights. Sophisticated growers supplement dedicated wavelenghts of light according to the individual training targets and plant development stage.
How to save money?
Our prices are calculated at very low margins. Still, we want to give you the opportunity to save some bucks. Help us, and we help you 🙂