Lighting device for use in lighting of cheese
The invention provides a method of selecting the suitability of a lighting device ( 100 ) for use in cheese lighting, the method comprising (a) defining a normalization factor (k) for a spectral power distribution (SPD(λ)) of lighting device light ( 101 ) of said lighting device ( 100 ) in a wavelength range of 380-780 nm, (b) defining the lighting device ( 100 ) suitable for use in cheese lighting when a cheese damage function value (CDFV) is equal to or below 2, wherein the cheese damage function value (CDFV) is defined as: (I) wherein: (II) wherein y (λ) is a 2-degree color matching function, and wherein DF(λ)=1 for 380 nm≤λ<410, and wherein for 410≤λ≤780: (III). CDFV = k × ∑ λ SPD ( λ ) · DF ( λ ) · Δλ ( I ) k = 100 ∑ λ SPD ( λ ) · y _ ( λ ) · Δλ ( II ) DF ( λ ) = 0.95 × e - ( λ - 410 22 ) 2 + 0.05 × e - ( λ - 410 105 ) 2 ( III )
1. A method of selecting the suitability of a lighting device for use in cheese lighting, the method comprising (a) defining a normalization factor for a spectral power distribution (SPD(λ)) of lighting device light of said lighting device in a wavelength range of 380-780 nm, (b) defining the lighting device suitable for use in cheese lighting when a cheese damage function value (CDFV) is equal to or below 2, wherein the cheese damage function value (CDFV) is defined as:
CDFV
=
k
×
∑
λ
SPD
(
λ
)
·
DF
(
λ
)
·
Δλ
wherein:
k
=
100
∑
λ
SPD
(
λ
)
·
y
_
(
λ
)
·
Δλ
wherein y (λ) is the 2-degree color matching function, and
wherein DF(λ)=1 for 380 nm≤λ<410, and
wherein for 410≤λ≤780:
DF
(
λ
)
=
0.95
×
e
-
(
λ
-
410
22
)
2
+
0.05
×
e
-
(
λ
-
410
105
)
2
.
2. The method according to claim 1 , defining the lighting device suitable for use in cheese lighting when the lighting device light also has a correlated color temperature (CCT) of at least 2400 K.
3. A method of lighting cheese, the method comprising illuminating said cheese with lighting device light having a cheese damage function value (CDFV) as defined in claim 1 of equal to or below 2,
wherein the lighting device light has a spectral power distribution with a at least two main bands providing intensity in the entire spectral region of 440-740 nm, with a first emission band having a first maximum in the range of 450-470 nm, a local minimum in the spectral range of 470-500 nm, and a second emission band having second maximum in the range of 600-620 nm, wherein the first maximum has a peak height of less than 50% and more than 20% of a peak height of the second maximum, wherein the second band has a bandwidth in the range of 100-170 nm, and wherein the local minimum has a minimum intensity in the range of 50-90% of the first maximum.
4. The method according to claim 3 , wherein at least 80% of a total energy provided as visible light to said cheese consists of said lighting device light, and wherein the cheese is selected from the group selected from the group consisting of Gouda, Edam, Tilsit, Gruyere, Cheddar, Emmental and Maasdam.
5. The method according to claim 3 , the method comprising illuminating said cheese with said lighting device light while the cheese is contained in a refrigerated display equipment.
6. A cheese logistics method comprising (a) providing said cheese and (b) transport of the cheese, the method comprising subjecting the cheese during at least 80% of a time period from production of said cheese until and including transport of said cheese to the substantial absence of light or to illumination with lighting device light having a cheese damage function value (CDFV) as defined in claim 1 of equal to or below 2,
wherein the lighting device light has a spectral power distribution with a at least two main bands providing intensity in the entire spectral region of 440-740 nm, with a first emission band having a first maximum in the range of 450-470 nm, a local minimum in the spectral range of 470-500 nm, and a second emission band having second maximum in the range of 600-620 nm, wherein the first maximum has a peak height of less than 50% and more than 20% of a peak height of the second maximum, wherein the second band has a bandwidth in the range of 100-170 nm, and wherein the local minimum has a minimum intensity in the range of 50-90% of the first maximum.
7. The method according to claim 6 , wherein the time period also includes one or more of (a) a ripening stage of the cheese, (b) a storage stage of the cheese, and (c) processing of said cheese.
8. The method according to claim 6 , the method comprising illuminating said cheese with said lighting device light while the cheese is contained in a refrigerated display equipment.
9. The method according to claim 6 , wherein the cheese is provided as packaged cheese.
10. A lighting device configured to provide lighting device light having a cheese damage function value (CDFV) is equal to or below 2, wherein the cheese damage function value (CDFV) is obtained by (a) defining a normalization factor (k) for a spectral power distribution (SPD(λ)) of lighting device light of said lighting device in a wavelength range of 380-780 nm, (b) defining the lighting device suitable for use in cheese lighting when a cheese damage function value (CDFV) is equal to or below 2, wherein the cheese damage function value (CDFV) is defined as:
CDFV
=
k
×
∑
λ
SPD
(
λ
)
·
DF
(
λ
)
·
Δλ
wherein:
k
=
100
∑
λ
SPD
(
λ
)
·
y
_
(
λ
)
·
Δλ
wherein y (λ) is a 2-degree color matching function, and
wherein DF(λ)=1 for 380 nm≤λ<410, and
wherein for 410≤λ≤780:
DF
(
λ
)
=
0.95
×
e
-
(
λ
-
410
22
)
2
+
0.05
×
e
-
(
λ
-
410
105
)
2
,
wherein the lighting device light has a spectral power distribution with a at least two main bands providing intensity in the entire spectral region of 440-740 nm, with a first emission band having a first maximum in the range of 450-470 nm, a local minimum in the spectral range of 470-500 nm, and a second emission band having second maximum in the range of 600-620 nm, wherein the first maximum has a peak height of less than 50% and more than 20% of a peak height of the second maximum, wherein the second band has a bandwidth in the range of 100-170 nm, wherein the local minimum has a minimum intensity in the range of 50-90% of the first maximum.
11. The lighting device according to claim 10 , wherein the lighting device is configured to provide lighting device light having a correlated color temperature (CCT) selected from the range of 2200-3000 K, and a general color rendering index (R a ) of at least 90.
12. The lighting device according to claim 10 , comprising a first light source configured to provide first light source light having a correlated color temperature (CCT) selected from the range of 1800-2200 K, and a second light source configured to provide second light source light having a dominant wavelength in the green spectral region.
13. The lighting device according to claim 10 , wherein the lighting device light further having a color rendering index (R a ) of at least 80, a correlated color temperature selected from the range of 2500-2800 K, and a color point of x=0.4656±0.05, y=0.4146±0.05.
14. The lighting device according to claim 10 , wherein the lighting device light has a spectral distribution, when normalized to 1, as defined in FIG. 6 or deviates in intensity thereof with at maximum 5% of the highest intensity.
15. A system comprising (i) a refrigerated display equipment comprising a display part for displaying cheese ( 1 ) and(ii) a lighting device according to claim 10 configured to illuminate the display part.