| Summary: | 碩士 === 國立臺灣大學 === 農業機械工程學系 === 84 === The substitution of artificial light for daylight is found in
so-called growing rooms where all natural daylight is
excluded. Conventionally , fluorescent lamps are used. In
order to improve the uniformity and reduce the number of
lamps required,without reducing the amount of light required,
the effects of using reflecting surfaces were studied . The
mov- able downward plus vertical sideward light mounting
fixture developed can also meet the two goals mentioned when
comparing with the conventional fixed mounting downward
lighting system. Spectroradiometer was used to retrieve the
spectral distribu- tion information of 18 commercially
available fluorescent lamps. Cumulative distributions of light
provided by each lamp is then formulated by using regression
technique.The equations are comp- uterized to allow the
calculation of spectral bin data ( light level within a given
waveband ) and ratio of light level among waveband.The
conversion factors from photometric unit to quantum unit for
all lamps are also derived. A simulation software was
developed to enable the design of the light environment on
bench using combine-lamps. The spectral distribution and the
spatial distribution of combine-lamps on a given area can be
revealed.The uniformity of the light level can be calculated.
Other results of this study including (1) comparing the spec-
tral distribution of combine-lamps with the active
photosyn- thetic response curve and define a mismatching index
to quantify the results of comparison , ( 2 ) define a term
named ''Apparent Photosynthetically Photon Flux Density''
(APPFD)(3)Ratio of APPFD to PPFD can provide a clear
understanding on how sensitive of the plant in terms of
photosynthes is when receiving a photon provided by the given
light source.
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