LED Grow Lights 2020 - White LEDs; Household LED Bulbs and LED Tubes?
12-22-2019, 07:28 PM
Two decades of Academic Research clearly indicates that spectrum and intensity dictate the growth and shape (morphology) of a plant, with broad / wide spectrum resulting in healthiest growth and production. The “Limiting Factor” initially with White LEDs (WLEDs) as Sole Sourse Lights (SSL) was Low Electrical Efficiency, which was overcome with the advent of the current generation of WLEDs that produce over 100 Lumens per Watt (L/W). Following are two (2) lengthy but informative interviews with Academic Agricultural Lighting Researchers and this article; What Is The Best Grow Light Spectrum?
Household LED Bulbs (UL and or DLC Listed) can provide adequate PAR and EPAR / PBAR (light) contrary to "Perpetuated Grow Light Misinformation / Myths" . 2700K and 3000K LED bulbs rated 80 or more CRI can provide better PAR spectrum than Red / Blue LEDs and HPS, the Agricultural Industy incumbent grow light, while 4000K and 5000k LEDs can provide better spectrum than Metal Halide and Fluorescent. Standard 100 Watt Equivalent LED light bulbs labeled as 1600 Lumens per 15 watts (Actual Measured Output) produces over 1700 Lumens with the opaque globes removed, resulting in at least 1.8 PPF efficiency and 4 foot T8 LED tubes labeled as 2200 Lumens per 17 watts are at least 1.9 PPF efficiency (1000 Lumens = or ~ 15 PPF).
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https://www.biorxiv.org/content/bior…15095.full.pdf
| Light Source | PPF (Efficiency) |
|---|---|
| 1000W DE HPS | 1.7 |
| 400W HPS | 1.5 |
| 400W MH HID | 1.4 |
| 315W CMH | 1.5 |
| Fluorescent | 0.9 |
| … | |
| WLEDs (100 L/W) | 1.5 |
| WLEDs (120 L/W) | 1.8 |
| WLEDs (130 L/W) | 1.9 |
…
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References:
https://www.biorxiv.org/content/bior…15095.full.pdf
https://www.biorxiv.org/content/bior…89280.full.pdf
https://www.ourfigs.com/forum/figs-h…r-fig-cuttings
https://www.ourfigs.com/forum/figs-h…504#post467504
https://journals.plos.org/plosone/ar…l.pone.0163121
Commercial White LED Grow Lights… 2020
https://images.homedepot-static.com/…b830887103.pdf
https://images.homedepot-static.com/…00bfc96eab.pdf