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LuxPy import issue in Conda (Python 3.12.13) #44

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LuxPy import issue in Conda (Python 3.12.13)#44
@frank984

Description

@frank984
frank984
opened on Apr 21, 2026

I am working in a Conda environment with the following installed packages:
luxpy 1.11.2
numpy 1.26.4
scipy 1.17.1
python 3.12.13

When trying to verify LuxPy installation:
python -c "import luxpy as lx; print('LuxPy OK', lx.version)"
the import fails with the following error:
TypeError: only 0-dimensional arrays can be converted to Python scalars.

Detailof installed packages below:
anyio 4.12.1
argon2-cffi 25.1.0
argon2-cffi-bindings 25.1.0
asttokens 3.0.1
async-lru 2.0.5
attrs 26.1.0
babel 2.17.0
beautifulsoup4 4.14.3
bleach 4.1.0
brotlicffi 1.2.0.0
cdsapi 0.7.6
certifi 2026.1.4
cffi 2.0.0
cftime 1.6.5
charset-normalizer 3.4.4
colorama 0.4.6
comm 0.2.3
contourpy 1.3.3
cycler 0.12.1
debugpy 1.8.16
decorator 5.2.1
defusedxml 0.7.1
ecmwf-datastores-client 0.5.1
epw 0.0.0
era5epw 0.6.0
et_xmlfile 2.0.0
executing 2.2.1
fastjsonschema 2.21.2
fonttools 4.62.1
h11 0.16.0
h5py 3.16.0
httpcore 1.0.9
httpx 0.28.1
idna 3.11
ipykernel 7.2.0
ipython 9.11.0
ipython_pygments_lexers 1.1.1
jedi 0.19.2
Jinja2 3.1.6
json5 0.12.1
jsonschema 4.25.1
jsonschema-specifications 2025.9.1
jupyter_client 8.8.0
jupyter_core 5.9.1
jupyter-events 0.12.0
jupyter-lsp 2.3.0
jupyter_server 2.17.0
jupyter_server_terminals 0.5.4
jupyterlab 4.5.6
jupyterlab_pygments 0.3.0
jupyterlab_server 2.28.0
kiwisolver 1.5.0
luxpy 1.11.2
MarkupSafe 3.0.2
matplotlib 3.10.8
matplotlib-inline 0.2.1
mistune 3.1.2
mkl_fft 2.1.1
mkl_random 1.3.0
mkl-service 2.5.2
multiurl 0.3.7
nbclient 0.10.4
nbconvert 7.17.0
nbformat 5.10.4
nest-asyncio 1.6.0
netCDF4 1.7.2
notebook 7.5.5
notebook_shim 0.2.4
numpy 1.26.4
openpyxl 3.1.5
packaging 26.0
pandas 2.2.3
pandocfilters 1.5.1
parso 0.8.5
pillow 12.2.0
pip 26.0.1
platformdirs 4.9.4
plotly 5.24.1
prometheus_client 0.24.1
prompt_toolkit 3.0.52
psutil 7.0.0
pure_eval 0.2.3
pvlib 0.15.0
pycparser 3.0
pyepw 0.1
Pygments 2.20.0
pyparsing 3.3.2
PySocks 1.7.1
python-dateutil 2.9.0.post0
python-json-logger 4.0.0
pytz 2026.1.post1
pywin32 311
pywinpty 2.0.15
PyYAML 6.0.3
pyzmq 27.1.0
referencing 0.37.0
requests 2.33.1
rfc3339-validator 0.1.4
rfc3986-validator 0.1.1
rpds-py 0.28.0
scipy 1.17.1
seaborn 0.13.2
Send2Trash 1.8.3
setuptools 82.0.1
six 1.17.0
soupsieve 2.5
stack_data 0.6.3
tenacity 9.1.4
terminado 0.18.1
tinycss2 1.5.1
tornado 6.5.5
tqdm 4.67.3
traitlets 5.14.3
typing_extensions 4.15.0
tzdata 2025.3
urllib3 2.6.3
wcwidth 0.2.14
webencodings 0.5.1
websocket-client 1.8.0
wheel 0.46.3
win_inet_pton 1.1.0
xarray 2025.7.0

Full detail of error message below:
(Python_3_12_13) C:\Users\frank984>python -c "import luxpy as lx; print('LuxPy OK', lx.version)"
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy_init_.py", line 263, in
from luxpy.color.cri import colorrendition as cri
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri_init_.py", line 213, in
from .colorrendition import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\colorrendition.py", line 241, in
from .VFPX import VF_PX_models as VFPX
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX_init_.py", line 18, in
from .VF_PX_models import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\VF_PX_models.py", line 94, in
from .vectorshiftmodel import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 899, in
_VF_PCOLORSHIFT = initialize_VF_hue_angles(determine_hue_angles = _DETERMINE_HUE_ANGLES, modeltype = _VF_MODEL_TYPE)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 882, in initialize_VF_hue_angles
outM = VF_colorshift_model(IllC, cri_type = cri_type, sampleset = rflM, vfcolor = 'g',pool = pool)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 479, in VF_colorshift_model
Rf, Rfi, Jabt, Jabr,cct,duv,cri_type = spd_to_cri(S, cri_type= cri_type,out='Rf,Rfi,jabt,jabr,cct,duv,cri_type', sampleset=sampleset)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\utils\helpers.py", line 1447, in spd_to_cri
cct,duv,St,Sr) = spd_to_jab_t_r(St, wl = wl, cri_type = cri_type,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\utils\helpers.py", line 697, in spd_to_jab_t_r
Sr = cri_ref(cct, ref_type = ref_type, cieobs = cieobs['cct'], wl3 = St[0])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\spectrum\basics\illuminants.py", line 683, in cri_ref
SrBB = blackbody(cct, wl3, n = n)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\spectrum\basics\illuminants.py", line 139, in blackbody
cct = float(cct)
^^^^^^^^^^
TypeError: only 0-dimensional arrays can be converted to Python scalars

(Python_3_12_13) C:\Users\frank984>python -c "import luxpy as lx; print'LuxPy OK', lx.version"
File "", line 1
import luxpy as lx; print'LuxPy OK', lx.version
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?

(Python_3_12_13) C:\Users\frank984>python -c import luxpy as lx
File "", line 1
import
^
SyntaxError: invalid syntax

(Python_3_12_13) C:\Users\frank984>python -c "import luxpy as lx; print'LuxPy OK', lx.version"
File "", line 1
import luxpy as lx; print'LuxPy OK', lx.version
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?

(Python_3_12_13) C:\Users\frank984>python -c "import luxpy as lx; print('LuxPy OK', lx.version)"
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy_init_.py", line 263, in
from luxpy.color.cri import colorrendition as cri
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri_init_.py", line 213, in
from .colorrendition import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\colorrendition.py", line 241, in
from .VFPX import VF_PX_models as VFPX
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX_init_.py", line 18, in
from .VF_PX_models import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\VF_PX_models.py", line 94, in
from .vectorshiftmodel import *
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 899, in
_VF_PCOLORSHIFT = initialize_VF_hue_angles(determine_hue_angles = _DETERMINE_HUE_ANGLES, modeltype = _VF_MODEL_TYPE)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 882, in initialize_VF_hue_angles
outM = VF_colorshift_model(IllC, cri_type = cri_type, sampleset = rflM, vfcolor = 'g',pool = pool)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\VFPX\vectorshiftmodel.py", line 479, in VF_colorshift_model
Rf, Rfi, Jabt, Jabr,cct,duv,cri_type = spd_to_cri(S, cri_type= cri_type,out='Rf,Rfi,jabt,jabr,cct,duv,cri_type', sampleset=sampleset)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\utils\helpers.py", line 1447, in spd_to_cri
cct,duv,St,Sr) = spd_to_jab_t_r(St, wl = wl, cri_type = cri_type,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\color\cri\utils\helpers.py", line 697, in spd_to_jab_t_r
Sr = cri_ref(cct, ref_type = ref_type, cieobs = cieobs['cct'], wl3 = St[0])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\spectrum\basics\illuminants.py", line 683, in cri_ref
SrBB = blackbody(cct, wl3, n = n)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\frank984\anaconda3\envs\Python_3_12_13\Lib\site-packages\luxpy\spectrum\basics\illuminants.py", line 139, in blackbody
cct = float(cct)
^^^^^^^^^^
TypeError: only 0-dimensional arrays can be converted to Python scalars

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