Although photometry, the measurement of the intensity and distribution of visible light, is important in many areas, most undergraduate physics courses do not include this topic. We present a simple introduction to key concepts in photometry, and as a fun example, we investigate the optics of a Jack O’Lantern.

1.
C.
DeCusatis
,
Handbook of Applied Photometry
(
AIP Press
,
Melville
,
1997
).
2.
Lighting Handbook: Reference and Application
, edited by
M.
Rea
(
Illuminating Engineering Society of North America
,
1993
), 8th ed.
3.
M. E.
Thain
and
F.
Hengstberger
, “
A new goniophotometer for the calibration of small luminous flux standard lamps
,”
J. Phys. E
15
(
6
),
675
678
(
1982
).
4.
D.
Forste
, “
A gonio-photometer for the accurate determination of luminous flux
,”
Licht-Forschung
1
,
30
36
(
1979
).
5.
O. C.
Jones
and
R. G.
Berry
, “
A new determination of the lumen
,”
Metrologia
6
(
3
),
81
89
(
1970
).
6.
R. W.
Boyd
,
Radiometry and the Detection of Optical Radiation
(
Wiley
,
New York
,
1983
).
7.
Y.
Ohno
and
R. S.
Bergman
, “
Detector-referenced sphere photometry for industry
,”
J. IES
32
(
2
),
21
25
(
2003
).
8.
Y.
Ohno
, “
Detector-based luminous flux calibration using the absolute integrating sphere method
,”
Metrologia
35
(
4
),
473
478
(
1998
).
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