TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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I'm getting new lights for my grow chamber since my project is done, I have more space, and my others lights broke. So shopping bulbs around I found these two types. Which one would be the better bulb to get?
If your fixture will run the T12 I would use them as they put out a little more light. You're talking 250 lumens for each bulb, which is not exactly insignificant when you have multiple bulbs.
If you are worried about the difference in CRI don't be.
CRI affects how true and natural your plants' colors will look under the lights. CRI 75 is fine and your plants will look good under them. Plants don't care about CRI.
Hmm....I personally don't have too much experience..... but I have tried getting a 2x 2' T12 at 5000k and compared to a 2' T8 3200K + 5000K, it was definitely weaker.
It really depends more on the bulb. Bulb manufacturers make many different formulations of phosphors to give certain color temperature and CRI. Lumen output can vary nearly 30% from one bulb to another in the same diameter and length. So unless you compared the same exact bulb in T8 vs T12 it's like comparing apples and oranges.
Most likely the one appeared brighter to you because of the 3200k bulb which is more red. Bluer wavelengths appear dimmer to us (think of the growlux plant bulbs which are bluish purple from mainly blue wavelengths and some red tossed iin). Plants however don't care how bright the light looks to our eyes.
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