B
Bobby Smith
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BS,
i hadn't read through your threads regarding this build until last night.
i am impressed. i'm REALLY looking forward to the grow.
so, i'll attempt to explain my reasoning behind my choice of option "C".
i assumed that even distribution of the light was desired. now, i've read that this is your intention. up front in your last thread you said, "the issue of keeping the lighting intensity consistent throughout the canopy is my biggest concern."
if you were concerned with the intensity of light at points say, 10 feet away from the lamps, the order would not matter. But as you get closer to the lamps, the order of them does have an impact upon what you get. it seems as if your lamps are about 18" apart vertically. so let's think about what light we will get 18" away from the lamps.
options "A" and "B" will provide more intense light where the HPS lamps (with more lumens) overlap and less light where the two MH lamps overlap. the lighting intensity will be less consistent.
options "C" and "D", at 18" distance will have the HPS light overlapping the MH light consistently from the centerline of the uppermost lamp to the centerline of the lowermost lamp. either option will give you equal intensity throughout that distance.
so that leaves the question of having the MH or the HPS lamp at the top (or the bottom). my personal theory is that the MH lamp is providing a spectrum of energy that is more efficiently used by the plant, but the lower equivalent color temperature of the HPS lamps do something to tell the plant that it needs to be putting that energy into flowering. i'm thinking that the use of the HPS in this type of application is more about the "signal" that it's giving the plant . . . and i don't think it needs a lot of light at that lower equivalent color temperature to give that "signal."
so assuming that the upper portion of your array will have a more optimum angle towards your plants (leaves) that this should favor the MH.
am i making any sense about this in words. it would be far easier for me to do this at the whiteboard.
Papa
You said grrrr...lmao.. I only thought people around here said that... Side note sorry about ur cool tubes.. Hope dude hooks u up....
Bobby - That is an awesome replacement price. I know too many people who put things up to see them up and walk away and forget they aren't attached, lol. I can't wait to see the build up and mounted! Give us some pics before you plant!
Papa, I am not aware that certain types of lighting make a plant think its veg/flower. While it is true that the plants use certain types of light more efficiently during the different stages of life, I am only aware that timing actually triggers this.
I have not done my own trial and errors around this. Are you suggesting that using red spectrum bulbs can force a flower even at 18 hour a days?
Are you suggesting that using red spectrum bulbs can force a flower even at 18 hour a days?
BS,
i hadn't read through your threads regarding this build until last night.
i am impressed. i'm REALLY looking forward to the grow.
so, i'll attempt to explain my reasoning behind my choice of option "C".
i assumed that even distribution of the light was desired. now, i've read that this is your intention. up front in your last thread you said, "the issue of keeping the lighting intensity consistent throughout the canopy is my biggest concern."
if you were concerned with the intensity of light at points say, 10 feet away from the lamps, the order would not matter. But as you get closer to the lamps, the order of them does have an impact upon what you get. it seems as if your lamps are about 18" apart vertically. so let's think about what light we will get 18" away from the lamps.
options "A" and "B" will provide more intense light where the HPS lamps (with more lumens) overlap and less light where the two MH lamps overlap. the lighting intensity will be less consistent.
options "C" and "D", at 18" distance will have the HPS light overlapping the MH light consistently from the centerline of the uppermost lamp to the centerline of the lowermost lamp. either option will give you equal intensity throughout that distance.
so that leaves the question of having the MH or the HPS lamp at the top (or the bottom). my personal theory is that the MH lamp is providing a spectrum of energy that is more efficiently used by the plant, but the lower equivalent color temperature of the HPS lamps do something to tell the plant that it needs to be putting that energy into flowering. i'm thinking that the use of the HPS in this type of application is more about the "signal" that it's giving the plant . . . and i don't think it needs a lot of light at that lower equivalent color temperature to give that "signal."
so assuming that the upper portion of your array will have a more optimum angle towards your plants (leaves) that this should favor the MH.
am i making any sense about this in words. it would be far easier for me to do this at the whiteboard.
Papa
P.S. - don't forget to wear your welding goggles when dealing with vertical bulbs, people.
EDIT: I guess I could swap the top two bulbs and have the dual arcs in the middle and the HPS on the outsides - methinks that would give me the most even canopy lighting (as even bulbs will certainly favor the middle) as well as giving me a better chance to see the true "effect" of the dual arc spectrum on the plants in the middle vs. the plants on the perimeter when both sets are receiving a comparable number of footcandles..........thoughts?
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