Lighting Low carbon
If we’re going
to save energy
it’s going to
cost money, we
can’t do it on the
cheap.
– David Loe
the industry knows little about, and one where more
research is needed, Loe argues.
New research yet to be published by Tom Cantwell,
a senior lecturer at the Dublin Institute of Technology,
also claims that the UV risk from single-skin CFLs
could be higher than previously thought, which some
fear could raise the risk of cancer. But Jacob says that a
single-skin CFL lamp secretes a microscopic amount of
UV which, if concentrated eight inches away from the
skin for one hour, has the same effect as being outside
in the sun on a winter’s day.
Another factor which lighters need to consider
when designing luminaire systems is daylight, which
should contribute to light that people “need, want and
enjoy”, adds Loe. Natural daylight became a rationed
Good lighting needs to > very, very significant 52 medium-sized power stations commodity after the Second World War, when people
satisfy a range of criteria,
and the equivalent of planting a billion trees.” realised that having lots of windows provided an outlet
say experts
But there is no use comparing a GLS with a CFL for heat to escape. But satisfying both won’t be cheap:
bulb in terms of output, stresses Jacob, as a CFL is a “If we’re going to save energy it’s going to cost money;
diffused light source and so will always give about 10 we can’t do it on the cheap.”
per cent less illumination: “[GLS] light bulbs have got Loe also suggests that the whole concept of space
one source of light and so people see them as being lighting needs to be reconsidered. He says task lighting
brighter. I don’t think we’ll ever get over that problem, could be used more effectively to illuminate a person’s
Classification
but [CFLs] are great for saving energy.” workstation, rather than every square metre of space
EU energy Jacob adds that, if every household were to fit three in the horizontal plane. Loe estimates that doing
label classes energy-saving light bulbs, it would save the UK enough this could immediately save between 20 and 30 per
for different energy to power all its street lamps. cent from the electricity lighting load. “You can’t cut
lamp types Light bulbs now come with an energy-efficiency [building lighting] out completely, but we just need
rating, but only those rated A or B will be permitted to reduce it to a lower level; one level on your task, >
Incandescent
for use in the future, incandescents will be branded
E , F , G
with an E, F or G.
Mains voltage halogen
But good lighting with less energy will be hampered
Banned bulbs timetable
D , E , F
if a lighter relies solely on complying with the guides
Stage Date The following lamps may no
and codes, emphasises Loe: “If you just use the guides,
longer be put into circulation
Low voltage halogen
as informative as they are, it will give you a fairly limited
E
1 1/9/2009 Frosted lamps (apart from
idea of the solution.” Loe also criticises the fact that the
Energy Class A) as well as
Halogen IRC 50 per
lighting installed rarely works with the architecture of
clear incandescent lamps of
cent energy saver
a building. He says questions a good lighter should be
80W or above
B
asking include ‘what’s the colour of the lamp?’, ‘can a
2 1/9/2010 Clear incandescent lamps
person do their job in that lamp type?’, and ‘how will
Retro LED
over 65W
glare affect their performance?’.
B
John Mardaljevic, from De Montfort University,
3 1/9/2011 Clear incandescent lamps
over 45W
Compact fluorescent
agrees that lighting designed by software simulations
with cover
alone where today’s compliance targets are being
4 1/9/2012 Clear incandescent lamps
B
chased, is likely to be worse than that proposed by
over 7W
an expert designer, who has experience and intuition
5 1/9/2013 Raising of quality
Bare compact
to draw upon. Working strictly to guides and codes
requirements
fluorescent
alone will also fail to help a designer create lighting that 6 1/9/2016 Lamps with Energy Class C
A
positively affects people’s health. This is an area that
46 CIBSE Journal September 2009 www.cibsejournal.com
CIBSEsep09 pp44-46,48 lighting.indd 46 21/8/09 14:31:26
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72