Hanging a light from roof lantern
theatwals
7 years ago
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Luciana
7 years agoRelated Discussions
roof lantern size
Comments (16)Hello PG. Your question is an interesting one! With regard to the size, it really depends on the look you wish to create. If you're looking to create an orangery style extension which is very popular at the moment, a larger lantern would be worth considering particularly from the perspective of adding the ‘wow factor’. However if the idea is to add a little light, then the smaller sizes you mention would certainly work. It's perhaps worth highlighting that the sliding folding doors will add light into the front of the extension but if you're looking to add light into adjacent rooms, a larger lantern would again be worth considering. You are very welcome to send your plans to us and we would be pleased to advise further. The link below is a project in London, the size of the longer roof lanterns are 2.4m x 1.2m. Hopefully this will give you an indication of the light created by a roof lantern of this size. Also like this example, you might like to consider more than one roof lantern to help define areas. We offer roof lanterns in purely aluminium and a combination of timber and aluminium. https://www.houzz.co.uk/projects/1427135/wrap-around-extension-featuring-3no-roof-lantern-installations-in-london...See MoreRoof Lantern Placement
Comments (15)Hi Farhaan There are standard sizes of roof lanterns (e.g 2000mmx1500mm), which some companies hold in stock so can help keep the costs down if you choose such a size. Two small low cost lanterns of 1000x1000 can place a good amount of light in your extension, however the overall extension size would easily allow a single large lantern, say 2000x2000, which would double the light opening area, and still only use a quarter of your available roof area - and you could go much larger if you wanted. It is amazing how much light a rooflight permits. If your budget allows for a large lantern it will utterly transform not just the extension, but ample natural light will flood into the old part of the house too. Solar glare coatings can be specified if you are worried about causing overheating, however a North facing extension will be shadowed by the upper floors of the rest of the house for most of the day so this may not be necessary. If you go for a rectangular rooflight, the alignment, horizontal or vertical, will make a difference to how you want the layout of the room or the draw of the light to affect the room. Lanterns leading towards the patio doors makes sense to me, but it will depend on the lines within the room. Also consider if you are putting a television into the area, how light will reflect off it and affect the viewing....See MoreFlat skylight vs roof lantern
Comments (3)Interesting question, and at least from my point of view, possibly more complex to answer than you may realize ... I suspect, but currently don't either have the time or mathematical rigor to fully model this from first principles, that a lantern will get you more light in a north-facing situation. This is for a combination of reasons: Reflection / Transmission ratios depend on the angle of incidence; steeper (i.e. "head on") means more transmission. Since the panes of a lantern are more-inclined than a flat rooflight (even on a pitched roof), expect more light through. For north-facing windows (i.e. permanently shadowed), it's _ambient_ light that counts - i.e. the more or less even brightness of the blue sky (or, less-bright evenly overcast sky ...). A roof lantern, with panes facing two or four different directions, is again "catching" more ambient light at steeper angles (transmitting it inside). Ambient light (blue sky) is polarized to a strong degree, and reflection/transmission also depends on polarization (strongest: 90 degrees from the Sun, or - "generally northwards"). On some times of the day, ambient sky polarization may be such that a flat rooflight will reflect a larger proportion of light than at others. Again, the differently-oriented panes of a lantern would balance this out more. If indeed your geometry is such that the roof opening would not be in the shadow all day long but receive some sunlight at some hours ... then a pitched-north-facing flat rooflight would be oriented disfavourably at such hours (away from the sun, so getting the light at shallow angles, reflecting much). I'm not a technical consultant for this kind of advice (only have a physics background, which makes me a decent smart-*ss on such questions), and I can't say out of my head if a lantern would give you twice-as-much light in your situation, or only 10%-more-light. And then, the glazing (coated, and how ? double/triple glazing ? water-white glass or ordinary "greenish" float glass?) also plays a role. If you want it quantified, contact a professional. Right-to-light surveys commonly do such calculations (if for a slightly different reason ... how much light do I loose if that five-storey block of flat is being built on my doorstep ...). Also ... an alternative, in some situations, may be an extension with a ridged roof (i.e. two opposite pitches), and then two flat rooflights (facing east/west). Large roof lanterns don't come cheap after all....See MoreIs a roof lantern worth it
Comments (3)Can you uploads some photos, inside & out? Also from a few times in the day (morning/noon/evening?) It depends as much on what is around you (buildings, trees etc) as the location/orientation. Costs of roof lanterns, fully installed, are not cheap, and the amount of disruption not insignificant, depending on how the roof is constructed. Any time you add such a "penetration" gives an additional potential leak point for your roof. While we are involved with installations with such features, usually it is only done when the roof is being replaced in full, or an extension added. Other options to consider are light tubes - or just really excellent feature & mood lighting. While there are ongoing running costs, you have to get through a lot of electricity & bulbs to get close to the cost of your roof lantern!...See MoreOasys Property Solutions
7 years agoOasys Property Solutions
7 years agoLuciana
7 years agolast modified: 7 years agoYvonne Davies
4 years agolast modified: 4 years ago
theatwalsOriginal Author