Originally Posted by
Max - LEDTonic
What Shreder said above^
One watt will produce 3.41 Btu/h, and 100w LED, HPS, MH, or CFL, will all produce just as much heat, 341 Btu/h.
The difference between them is how much light they can produce with 100w, and that differs a lot.
Even if a light source is 100% efficient and all of the 100 watts are turned into light, the light will eventually turn into heat. While mylar is highly reflective, every photon will at some point be absorbed on a surface, and become heat. Energy cannot be created or destroyed, it can only change form (the first law of thermodynamics), and the lowest form of energy is heat.
The more efficient lamps we use, the fewer watts we need to reach a certain light intensity. Aside from air exchange and ventilation to transport and manage heat, lamp efficacy is key when it comes to creating as little heat as possible.
Some of the light energy is converted to carbohydrates and stored in our plants but that's only between 3-6% of all the light that lands on our plants according to Wikipedia - Photosynthetic efficiency, which is a rather small part of all light created in our grow spaces.
Removing the LED's driver from a grow space will have an impact as it accounts for between 5-15% of a lamp's total heat output, as LED drivers often are between 85-95% efficient. Large MeanWell and Inventronics drivers are top-tier and often around 94% efficient. 6% of 630w results in around 38 watts of heat produced by the driver.
The 650r is a great lamp and produce as much light as a 1000w DE HPS (1770 µmol/s), while only drawing 630 watts.
Single-ended 1000w HPS lamps are even less efficient and seem to produce between 1000-1300 µmol/s, depending on the brand (source: Jacob A. Nelson & Bruce Bugbee).
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