Choosing grow lights

Choosing the right grow light can be a bit tricky, so we have put together this page describing some of the parameters that you need to consider and take into account when choosing your grow lights.
One must first take into consideration what the grow lights will be used for and of course where they will be fitted to achieve maximum comfort whether they will hang in a living room or a green house. It also happens that we receive emails from people overestimate how effective LED grow lights are, so to avoid that someone buys a for example 6w spotlight for a 1.5m large tree please continue reading this guide.

Where to grow plants with your lights

Before choosing a grow light it needs to have a purpose, what it will be used for and where it will be mounted.
You can for example either maintain and keep plants alive with plant lighting during the darker days of the year, like such plants and trees that you take in during the winter. Sometimes indoor plants just do not get enough light in a room where there are to small or to few windows. Both these situations would often require you to use plant lights with a lower wattage then if your idea is to grow for food, flowers or fruit.
Generally we recommend that 50 watts per square meter (Gemma LED lights) is just right for those who want to maintain healthy and happy plants, and between 30-50 watts for those who want to keep their plants alive during winter or give extra light to insufficient areas. What type of plants of course also matters, since some plants require more light and others require less.
For plants that are more light demanding it would be recommended to use more than 50 watts per square meter. If the purposes for using the plant lighting is to get the plants both to grow vigorously and produce flower and/or fruits, 100 watt or more per square meter is recommended.

Where to place and hang the plant lamp is also important to keep in mind. If the lamp is meant to be hung in a public and open space, it is more advantageous to have a narrower angle of light as they scatter less light around in to the surroundings. This means that the light will be concentrated where it is needed as well as it does not become disturbing to have in close proximity during evening and night time. Regular grow lights often use a much wider angle of light than Gemma LED, making it less efficient for plants and more annoying to use in open areas.

Beam angle

LED grow lights using 45 degree angleGrow lights using 90 degree beam angleToday we use a combination of 45 ° and 90 ° light angle in our grow lights. What beam angle the lamp is fitted with is listed in the product description for each product.

Generally, we use the narrower 45 ° angle for smaller lights and 90 ° for more powerful grow lights. This means that 45 ° lamps have a less illuminated surface at the same distance as 90 ° lamps but can still produce a good effect with the light even though the watt number is lower as there is a higher concentration of light. Mounting a 45 ° lamp at 1 meter distance from the floor gives a lit area of about 50Ø cm while a 90 ° lamp at the same distance emits a lit area of approximately 100Ø cm.

We recommend that you adjust the area according to the needs. If it is a small plant that needs extra light it would be better to use a smaller light with 45 °, but if it is a larger plant, a tree or even several plants that will be kept under the same light, it is better to choose 90 °.