Quote:
Originally Posted by Ellen H
Super bright and cool are what I'm looking for...whatever works best for the plant's growth and flowering.
My SO is a Physics professor...I love him and his enthusiasm for the subject but I glaze over after just a couple of minutes of his "explaining" 
---------- Post added at 03:03 PM ---------- Previous post was at 03:00 PM ----------
Ok. So it has a big spike of blue which I understand is more for vegetative growth, right? I'd also need a bulb with more red spectrum for flowering?
---------- Post added at 03:04 PM ---------- Previous post was at 03:03 PM ----------
Sorry folks, I'm really messing up the "reply" to specific posters. Sorry for any confusion. |
I was referring to "Amazon.com : LED 2' T5 6500K Tube : Garden & Outdoor"
Values are taken from what the site says. I just made a joke.
---------- Post added at 06:23 PM ---------- Previous post was at 05:49 PM ----------
Quote:
Originally Posted by wisdomseeker
By no means am I trying to start a pissing contest, but I'm a bit confused with your post. 6500K refers to kelvin temperature (sometimes referred to as CCT or correlated color temperature), not spectrum. Science jargon aside: kelvin is loosely used in lighting as an overall measurement for the color temperature of light (sort of like an indicator of the perceived color of a light source). The higher the temperature (K), the bluer the light will appear. The lower the temperature, the warmer the light will appear (more red). Color temperature (K) has little to do with spectrum. You can calculate kelvin (K) from spectrum, but you cannot know spectrum based on kelvin.
A kelvin number (6500k as an example) means there is a strong emission line at that frequency. Kelvin temperature consists of almost an infinite number of wavelengths to produce a perceived color. Different spectral emission patterns (nanometer wavelengths) can produce light of similar color (example: 6500K).
A really good point. I like to use light that is beneficial for my plants, but also want light that appeals to "my eye". Unfortunately, some of the LED 'grow lights' consist heavily of blue/red light. Maybe okay (or maybe better than okay for plants) but sure the 'heck' does not look good to my "eye". I personally like to look at my plants under a white light (with a touch of warmth). Many of the LED 'grow lights' with good spectrum and a high CRI (color rendering index) will produce a nice white-colored light in appearance, and it really does justice to both the leaves & flowers of the plant ~ within the 'eye' of the beholder.
The tried and true mix of 3500k & 6500K has worked for many people for a long time. Opinions will vary (vastly) in regards to your questions about "full spectrum", specific kelvin temperatures, and what's "best" for growing orchids.
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My friend, what I showed in that 6500K.jpg is exactly the spectrum of light emitted by that 6500K LED from Amazon.com: LED 2 'T5 6500K Tube: Garden & Outdoor. No joke. The problem is that 1400Lumen/24W = 58.33. That's the idea! It's a joke... It is the most inefficient LED light source.
~Cheers
Hybrid Mode
