Not necessarily, that's just how it worked out. The slight underlighting at the corners is just an acceptable imperfection, which could easily be reduced or eliminated if the fixtures are moved closer to the wall and spread. It's just a matter of how much time you want to invest in getting them as perfect as possible.ORCO wrote:Per Lugnuts sketch, the corners of the wall do not need to receive the minimum 80 footcandles. The first and last fixture in the row is placed so that the tangent of the 80 footcandle circle hits the wall perpendicular to the accent wall.
carmelia78 wrote:i dont get it....
why is the four/ five recessed accent light acceptable but not the three?
according to the light diagram, 80fc @ 5' above ground should have the recessed accent light space 4' apart from center, correct?
If so, three lights should be enough...
Coach wrote:carmelia78 wrote:i dont get it....
why is the four/ five recessed accent light acceptable but not the three?
according to the light diagram, 80fc @ 5' above ground should have the recessed accent light space 4' apart from center, correct?
If so, three lights should be enough...
No. You're looking at the chart as if using the lights for area lighting. Accents are for lighting the wall. To provide the correct lighting the circles must intersect at the wall.
ORCO wrote:I want to make sure I understand this correctly. Please correct me if I am wrong
Per the program, "locate the accent light fixtures along the [wall] so that the direct light level on the wall at a height of 5 ft above the floor is 80 footcandles." What we need to do is locate them so the MINIMUM direct light hitting the wall is 80 footcandles, which is the midpoint between the fixtures on the wall. The wall perpendicular to the fixture will have more than 80, perhaps 90 or so footcandles.
Per the program, "space the accent light fixtures so that the light level between the fixtures at 5 ft above the floor is 80 footcandles." After determining the radius of the sketch circle to acheive 80 footcandles and placing them so that they create intersections at the wall halfway between them, considering the footcandles between the lights is irrelevant because the 80 footcandle circles will then be overlapping. If you drew a line from the center point of one fixture to another, and read the footcandles at the midpoint, the reading will be much higher than 80, perhaps 90 footcandles from two sources.
Per Lugnuts sketch, the corners of the wall do not need to receive the minimum 80 footcandles. The first and last fixture in the row is placed so that the tangent of the 80 footcandle circle hits the wall perpendicular to the accent wall.
purplepride wrote:This forum has convinced itself that the entire wall must have a minimum 80 footcandles at 5ft and tells you to do this over thinking and overlapping of fixtures, but no one has proof that this is the way it should be.
What do you think this means? "Space the accent light fixtures so that the light level between the fixtures at 5 ft above the floor is 80 footcandles."
That is my 2 cents, take it or leave it.
What do you think this means? "Space the accent light fixtures so that the light level between the fixtures at 5 ft above the floor is 80 footcandles."
cpoules wrote:What do you think this means? "Space the accent light fixtures so that the light level between the fixtures at 5 ft above the floor is 80 footcandles."
Exactly. And what you are suggesting Coach is a lot more than 80 footcandles if they overlap. This implies that we ignore the lighting chart between fixtures?
This is what the program says: "Locate the accent light fixtures along the west wall of the Architect’s Office so that the direct light level on the wall at a height of 5 ft above the floor is 80 footcandles."
That is not possible if you dont overlap.
Also, the fixture is 6" diameter so shouldn't we be measuring 2'3" from the center of fixture?
This is what the program says: "Locate the accent light fixtures along the west wall of the Architect’s Office so that the direct light level on the wall at a height of 5 ft above the floor is 80 footcandles."
That is not possible if you dont overlap.
cpoules wrote:I understand what you are suggesting Coach but the program also says immediately after: Space the accent light fixtures so that the light level between the fixtures at 5 ft above the floor is 80 footcandles
This would imply an excess of footcandles in the area of overlap if you do as you suggest. Which implies a down grade. It seems it's either one or the other here.
cpoules wrote:For YOU it seems certain Coach. You have yet to convince me (and apparently a lot of others on this forum). It is very unclear and from what i have read here, it is far from damned definitive. I DO appreciate the discussion though. thank you.
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