“The L4A gave the best result ever (on our Alpine plants). Now with the LX60s we get even better results”
“During the winter months, it is important for us to add extra light supplementation. High Altitude Plants such as Alpine Perennials and Dyonysia is very difficult to cultivate. Heat is one of the big issues, we therefore had quality issues with our plants under our old HPS lamps. The benefits we received with the LX60 breaks all records in terms of both survival and quality… further 100 percent of our Dionysia-cuttings survived and that’s exceptional!”
- Marika Irvine, gardener at Gothenburg Botanical Garden
Gothenburg Botanical Garden, with its 175 hectares in central Gothenburg, is one of the largest botanical gardens in Europe. The cultivated part occupies about 40 hectares and there are about 16 000 species of plants. A large number of these are part of the scientific collections, including one of Europe’s largest collections of Bulbs and Tubers, Alpine and the Dionysia. Since 2013 the Botanical Garden has used Heliospectra Grow light systems, they currently use our new LX60 and has received great results.
Research Articles, White Papers & Trials
Article: Economic Analysis of Greenhouse Lighting: Light Emitting Diodes vs. High Intensity Discharge Fixtures
Written by: Jacob A. Nelson, Bruce Bugbee, from Utah State University
“We recently tested a new, small-profile, 600-W LED fixture from Heliospectra in Sweden (model LX601G). Our measurement using flat plane integration indicate that this fixture has an efficiency of 1.7 micromoles per joule, which is equal to the best LED and DE-HPS fixtures we tested. This fixture had a relatively broad distribution of photons compared to other LED fixtures we tested.”
Lighting technologies for plant growth are improving rapidly, providing numerous options for supplemental lighting in greenhouses. Here we report the photosynthetic (400–700 nm) photon efficiency and photon distribution pattern of two double-ended HPS fixtures, five mogul-base HPS fixtures, ten LED fixtures, three ceramic metal halide fixtures, and two fluorescent fixtures. The two most efficient LED and the two most efficient double-ended HPS fixtures had nearly identical efficiencies at 1.66 to 1.70 micromoles per joule. These four fixtures represent a dramatic improvement over the 1.02 micromoles per joule efficiency of the mogul-base HPS fixtures that are in common use. The best ceramic metal halide and fluorescent fixtures had efficiencies of 1.46 and 0.95 micromoles per joule, respectively. We also calculated the initial capital cost of fixtures per photon delivered and determined that LED fixtures cost five to ten times more than HPS fixtures. The five-year electric plus fixture cost per mole of photons is thus 2.3 times higher for LED fixtures, due to high capital costs. Compared to electric costs, our analysis indicates that the long-term maintenance costs are small for both technologies. If widely spaced benches are a necessary part of a production system, the unique ability of LED fixtures to efficiently focus photons on specific areas can be used to improve the photon capture by plant canopies. Our analysis demonstrates, however, that the cost per photon delivered is higher in these systems, regardless of fixture category. The lowest lighting system costs are realized when an efficient fixture is coupled with effective canopy photon capture.
Akron White Paper: A Study of Quantitative Lamp Spectra and Hydroponic Lettuce Growth
Key Participants: Tim Madden, President Biodynamicz, Roger Buelow, President Light for Life, Dr. Richard Hansler, Lighting Innovations Institute, John Carroll University; Cleveland , Ohio. Wil Hemker, The University of Akron Research Foundation (UARF); Akron, Ohio. Ruth Zito, Horticulturalist NuLight ,LLC,
“This comparative leafy green lettuce crop growing study found that the Heliospectra AB series LX 60 LED lamp grew the tastiest and most attractive lettuce for all five lamps.”
To extend day length in crop growing the interest in studying artificial lighting has grown. This study focused on the comparative characteristics of lamp spectra qualities of commercial state of the art agriculture lamps of high pressure sodium (HPS), inductive fluorescence and LED types.
To compare a reference greenhouse food plant crop’s productivity when grown in like hydroponic environments when the artificial light source is varied. Using commercial light sources including; HPS lamps, inductive fluorescent and LED grow lamps.
The hydroponic lettuce growing was conducted in a controlled indoor environmental lab, using Nutrient Film Technique (NFT) hydroponic channels to grow out the lettuce crop. A baby gem romaine lettuce variety,(Lactuca sativa: v. Green Star), was used with a targeted maturation size 170 grams or six ounces.
For each lamp tested the following response variables were measured; comparative energy consumption, light spectra full characterization, intensity at plant canopy, plant growth rate that was measured as fresh wet weight per head at harvest time, and dry weight. Plant quality was observed throughout the growing process on a subjective basis, plant sugar quantity (brix), sensory qualities (bitterness, appearance, flavor, texture and overall acceptability) were compared after harvest for each lamp evaluated.
This comparative leafy green lettuce crop growing study found that the Heliospectra AB series LX 60 LED lamp grew the tastiest and most attractive lettuce for all four lamps.