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Hi yall imconductin an experiment with my lighting. I used to have a double light fixture with two 28 watt t-5 normal output. One burned out and i had an extra 420 layin around so i put it in the fixture and see how it works out. Now lets see how well my plants grow with one 10k and one 420. Udate when i notice any changes.
 

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Depending on who's chart you look at, the 420 nm bulb is in the range of plant use.
On one chart I recently saw, it's better for chlorophil A than the 460 nm.
That having been said, what bulb did you have in there before it ?
 

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You might look up the actual bulbs you had (and still have one of) and see what sort of spectrum they have. 10,000 K is decidedly toward the blue to our eyes. Probably missing a fair amount of the reds that plants need.
 

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You might look up the actual bulbs you had (and still have one of) and see what sort of spectrum they have. 10,000 K is decidedly toward the blue to our eyes. Probably missing a fair amount of the reds that plants need.
Regardless of white temp... most flour. lights are just RGB phosphors anyways...


http://www.lamptech.co.uk/Documents/FL Phosphors.htm

Selective additions create "colored"...
 

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Anyone feel free to ammend this.
In a "blue" or "red" bulb all the energy is being used to provide light in a spectrum which plants can use best.
Other bulbs often caled "white light bulbs" use energy to provide a wide spectrum of light most of which is a bit harder for the plants to use, except for any blue or red part of them.
I have seen pictures of plant farms where there is no light except red bulbs.
 
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