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Description
cheap grow light bulbs LED Grow Light 52.54 PPF 40W E26Product Details 52. 54 PPF activates the photosynthesis process necessary for healthy plant growth Low heat output keeps plants cooler and retains moisture Full spectrum color for boosting plant growth in all stages: seeding, budding and flowering Shatter resistant polycarbonate lens Integrated LED that never needs to be replaced E26 medium base fits standard lighting fixture ETL rated for damp locations Specs PPF: 52. 54 Energy used: 40 watts Red PF:
Product Details
- 52.54 PPF - activates the photosynthesis process necessary for healthy plant growth
- Low heat output keeps plants cooler and retains moisture
- Full spectrum color for boosting plant growth in all stages: seeding, budding and flowering
- Shatter-resistant polycarbonate lens
- Integrated LED that never needs to be replaced
- E26 medium base fits standard lighting fixture
- ETL rated for damp locations
Specs
- PPF: 52.54
- Energy used: 40 watts
- Red PF: 35.31
- Blue PF: 11.48
- Red spectrum (nm): 645 nm
- Blue spectrum (nm): 455 nm
- Energy source: E26, AC120V
- Lifetime hours: 50,000 hours, based on 3 hours of use per day
- Operation temperature: -5º - 113º F
- Beam angle: 120º
- 3 year limited warranty
User Manual
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- Free Standard Shipping on $100+ Orders to the USA.
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4.4 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Wonderful. This is the book on time I've been looking for.
Format: Kindle
This is the book about time that I wanted. Beautifuly done. Thank you.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2025
★★★★★ 3
Not so great unless you are willing to accept a certain amount on faith.
Format: Paperback
Similar criticism to my review of the Black Holes book: "Starts off ok, but quickly loses you. I have an extensive science education and quickly got lost. This topic cannot be easily explained in a brief book - the author is forced to jump over certain building blocks, and that just leaves the reader confused. I think this book series is good, but maybe not for abstract science topics."
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
★★★★★ 5
A fun read. Learned a lot.
Format: Kindle
I never expected to be able to understand Relativity or the more ethereal concepts of time. But Jenann brought them to my level. The language gets a bit flowery at times but I think that reflects that these ideas have a poetry of their own.
RL
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 10, 2023
★★★★★ 5
Clear, Concise, and Compelling
Format: Kindle
The author takes us in an extraordinary trip through and about time. In particular, the discussion about Einstein’s Special and General Theories of Relativity were illuminating, clarifying a complex aspect of the nature of the universe. How should we think about time? This book will help the reader arrive at answers to that question.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 30, 2021
★★★★★ 5
Deep important and illuminating
Format: Kindle
Worth a second read. I keep going back to it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 2, 2023
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