Light Tubes for Interior Lighting
Light Tubes For Interior Lighting
Find out more about light tubes (aka Sun tubes) and their useslighting
A light tube
(aka Sun tube
, Sun pipe
, or tubular skylight
) is a tube or pipe used to transport daylight
from the exterior of a building to a room with no windows. This passive
lighting device uses zero electricity and therefore is not responsible for any carbon emissions
is much easier on the eye than artificial lighting, and it can help reduce the effects of seasonal affective disorder
A light tube
is typically made up of three simple components:
1. A round dome
(aka cupula) which collects as much sunlight as possible from all angles while blocking out 99+% of harmful UV rays. A Fresnel lens
is sometimes used instead, but with the same end result. The collected light is directing it into a...
2. highly reflective tube
. (With short straight tubes, light transmission efficiency can be well over 98%.) The light reflecting down the tube finally emerges at a...
. The diffuser spreads the light from the tube around the room to be lit preventing hot spots
(a problem of traditional skylights) from occuring.
Typically a sun tube
will lose 5-6% per metre of length the light must travel, and 10-15% for each 45 degree elbow
required to get the light from the roof to room.
DIY Sun Tube
An excellent guide to putting together a DIY Sun Tube System
is available by clicking here. This Extreme How-To
article is based around commercial Sun-Tek tubular skylight
kits. Click here for the official Sun-Tek Tube fitting instructions
Light Tubes in the UK
Prices for installation of a single light tube
system in the UK start at around £500, increasing if tube extensions
are required due to the roof being far away from the room to be lit. A combined natural light and ventilation system
for a bathroom would typically cost £1000-£1,500 installed.
Huge savings can be made if you are able to install the system yourself since the component parts are available from as little as £200 for a complete single tube system.
Useful Web Sites
- sole distributor in UK and Ireland for Solatube
- one of the World's leading solar lighting manufacturers.
- provide domestic and commercial sunpipes
, and their MonoVent
Article Last Modified: 15:07, 9th Aug 2012
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