I dont think people from all over the world all got togeather and said let's rigg an experiment.. again. There is countless side by side grows(Cleary different tents) watt for watt over led and hps.. some studies has countless pics all through the growth other studies just has documentation.. each study shows HID will allways produce more bud.. not a crazy amount more but a decent amount more.. its something about the heat and infrared waves that stimulate the plants metabolism, and something about how the HPS light that is produced some how penetrates the canopy... just google and see the results for your self. Or if your into theory get a better understanding on the actual case study. Don't follow just 1 source. Read independently operated studies, read commerical.studies
This is just ai i am at work but i will give you links since you cant find any
Research Links
LED vs. HID: Choosing the Best Grow Lights for Growing Indoors
This article discusses the differences in lighting technology and how it affects cannabis growth, focusing on metrics like Photosynthetic Photon Flux Density (PPFD) and spectral output. It highlights LED's advantages in temperature management and light distribution.
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What Grows Better Weed - LED or HPS?
This source states that LEDs can
yield 50% to 300% more efficiently than HPS lamps. It emphasizes that controlled tests show that cannabinoid levels in cannabis grown under LED are often the same or better than with HPS.
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Are HPS Grow Lights Better Than LED Grow Lights to Grow Cannabis?
This article discusses the pros and cons of both types of lighting, pointing out that while LEDs are generally more efficient and customizable, HPS lights have their own historical reliability.
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Saving Energy With LED vs. HID Grow Lights
This guide breaks down how LED lights outperform HID in terms of energy efficiency and plant yield while also providing insights into their operation and benefits.
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Advantage of using old-school HPS/MH over LED
A forum discussion that weighs the longstanding familiarity and initial cost factors of HPS lights against the benefits of modern LED technology.
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Key Comparisons
Efficiency
LEDs tend to be more energy-efficient and provide more usable light per watt than HIDs. They often allow growers to achieve similar or superior yields while using lower wattage.
Heat Management
LEDs generate less heat, reducing the need for additional cooling systems, while HIDs produce more heat and require careful temperature management.
Adjustability
LED lights typically allow for spectrum adjustments to optimize growth phases (vegetative vs. flowering), whereas HIDs have more fixed outputs.
Cost and Lifespan
HIDs are usually cheaper upfront but may incur higher long-term costs due to electricity and bulb replacement. LEDs have a higher initial cost but lower operational costs over time.
These resources and insights should provide a comprehensive understanding of the advantages and disadvantages of LED and HID lighting for cannabis cultivation. If you have more specific queries or need further clarification, feel free to ask!