Why don't floor plans seem to optimize much for sunlight?
Marco Ferreira
3 years ago
last modified: 3 years ago
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Geeky sunlight question for you lighting experts
Comments (23)>There are a lot of mis-conceptions in this thread. True, and that is why I posted to attempt unification of the partial answers into a comprehensive answer for John. Unfortunately you have introduced several new misconceptions in your answer which I must rebut. I won't quibble with your advice to measure the light with meters nor the link which I have not looked at but: >all light diminishes as it travels through space, the atmosphere etc. This is absolutely not true in the case of interstellar space. The atmosphere, yes, but it takes miles of atmosphere to affect the intensity of solar light to any appreciable extent. >The sunlight reaching the earth is a misiscule amount of what leaves the sun. Of course, but not because there was any degredation in light intensity from traveling 93M miles through space but because only the portion of solar disk directly intercepted by Earth gets light from the Sun. If there could be a shade on the Sun capturing all the light that heads off in other directions it would all get here. You think Global Warming is bad? >Most glass absorbs a lot of light and that light level diminishes exponetionally as the distance changes. Most glass absorbs minimal light unless heavily tinted. Windows are not usually heavily tinted. And a given thickness of glass does not absorb any more or less light as the distance changes, it is a fixed amount of reduction. >Much glass has UV absorbtion factors built into the glass. A good thing. UV is an undesirable by-product and has no bearing on the intensity of beneficial light frequencies. >This also happens outdoors not just windows. The light level at the roof of a greenhouse or shadehouse will be much stronger that lower near the floor. In an absolutely empty greenhouse the light will be exactly the same at the floor as at the roof. It is only in the typical packed to the rafters greenhouse that one has to hang high light plants at the apex to get them out of the shade of competing plants. Under the benches the only direct sun is low angle sidelight and I will explain why that light is lower intensity next. >Light is filtered heavily as it goes through the atmosphere. When I measure sunlight in an open southern exposure in SW Florida in July it is usually 11,000 foot candles. In December at the same spot it never exceeds 5,000. The sun is lower in the sky and travels a longer distance with more being filtered along the way. This is why it is colder in winter and plants slow down growth. If you could do the trigonometry of how much more atmosphere the sunlight passes through in December vs July you would see that while in essence your observations are correct the reasons are obvious. It takes many, many thousands of feet of atmosphere to lower the intensity of the sun any appreciable amount and the trivial distances involved in, say the difference between the roof of a greenhouse and the ground or at the windowpane and 3' into the room are beyond miniscule. >The only way to judge your light is to measure it. A reference for measuring with a camera is attached. The only way for greenhouse and patio growers to measure light is to measure it. For the indoor and windowsill grower there is little point to measuring a fixed quantity of light. That is kind of like buying a scale to weigh a 5lb. bag of sugar. Again I am sorry for the point by point dissection but a number of your 'mis-conceptions' came up in earlier posts so obviously you come by it honestly but it is... incorrect in places. This forum is archived and is a legacy of sorts I would think we would want the most accurate information archived for posterity. And I absolutely am open to any of my points being challenged. I am not by any means infalliable or a know it all. H...See MoreGetting Natural Light Into Dark, Older House
Comments (24)Things I have done to improve natural light in my home: 1. front door now is mostly glass 2. removed full height pantry that was in the kitchen/entrance - there is a small load bearing wall there that will be replaced by columns (attached to kitchen island) 3. painted all walls off white 4. chose light coloured finishes in general 5. removed upper cabinets from around kitchen window 6. ensure that window coverings for privacy allow lots of light in Things I am considering doing 1. adding ODL tubular skylights to light windowless areas (from Home Depot) 2. replacing some interior doors that are usually closed with windowed ones to bring natural light into windowless hallway (doors can have curtains or blinds if necessary) 3. adding windows to bathrooms...See MoreSunlight Issues
Comments (49)@ewwmayo Thanks for the post that you tagged me in, I'm going to show it to my husband regarding the savings switching to T5. Right now I have all T12 fixtures since that's what I started out with for my vegetable plants so many moons ago (I just kept replacing the bulbs). I wanted to upgrade to T5 this year but once I saw the cost, I ended up walking out with more bulbs. Yes, I know it cost less in the long run, it was simply what I had money wise that particular day. Good news is that my husband asked for my T12 fixtures for his garage and the lawn mower shed (and I gladly gave them to him) so I'll be "forced" to get new ones this winter. What a shame, right?...See MoreLarge Covered Back Porch -- Need Ideas for More Natural Light
Comments (55)DK, I’m glad you mentioned that having the back of the home facing south would mean the master suite would be warmer as well. I don’t think that would be optimal in the Deep South - it’s just sweltering, and I cannot tolerate being hot in our bedroom. Is it crazy that I may now try to position our new home to AVOID the hot afternoon sun??!! I like light and all, but since it was mentioned that it won’t be a dungeon, I think I’m good with just some light trickling in the living room. Hubs is very sensitive to light and would be as happy in a cave... so he’s not too concerned about a lot of natural light coming in. We are doing lots of recessed lights throughout the home, and almost all will have dimmers, as I enjoy them in our current home and like the ability to have something in between dark and “in your face bright” on occasion. :) Funny you mention landscaping, as my husband owns a landscape company! I know nothing about any of it, but I’ve heard him mention things like this several times when a client wants ABC plants for a certain location, but only XYZ plants will thrive there. After speaking with my husband about the whole skylight/sun tube issue, he was not a fan - and for the exact same reasons given here (additional heat, “putting holes in the roof”/compromising structural integrity, additional cost, cost of potential repairs, etc... so it sounds like that’s out. He did say he might consider a couple of skylights in the roof on the covered porch only, but feels like that defeats the purpose of a COVERED porch. I mean, he’s not wrong there. LOL All that said, there has been a ton of good information given, and I appreciate all of it! I welcome and appreciate any and all suggestions and opinions - I’ve learned so much from y’all! Keep ‘em coming!...See MoreSeabornman
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