diff --git a/honeybee_schema/energy/construction.py b/honeybee_schema/energy/construction.py
index 3832d34..64d8b91 100644
--- a/honeybee_schema/energy/construction.py
+++ b/honeybee_schema/energy/construction.py
@@ -150,4 +150,4 @@ def schema_extra(schema, model):
     print(OpaqueConstructionAbridged.schema_json(indent=2))
     print(OpaqueConstruction.schema_json(indent=2))
     print(ShadeConstruction.schema_json(indent=2))
-    print(AirBoundaryConstruction.schema_json(indent=2))
+    print(AirBoundaryConstruction.schema_json(indent=2))
\ No newline at end of file
diff --git a/honeybee_schema/radiance/__init__.py b/honeybee_schema/radiance/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/honeybee_schema/radiance/material.py b/honeybee_schema/radiance/material.py
new file mode 100644
index 0000000..a4bbe0d
--- /dev/null
+++ b/honeybee_schema/radiance/material.py
@@ -0,0 +1,299 @@
+# TODO: change to Modifers Schema?
+"""Material Schema"""
+from pydantic import Field, constr, validator, root_validator
+from typing import List, Union
+
+from .._base import IDdBaseModel, BaseModel
+
+
+class Void(BaseModel):
+    """Void modifier"""
+
+    type: constr(regex='^void$') = 'void'
+
+
+class ModifierBase(IDdBaseModel):
+    """Base class for Radiance Modifiers"""
+
+    modifier: Union[
+         Void, 'Plastic', 'Glass', 'BSDF', 'Glow', 'Light', 'Trans'
+    ] = Field(
+        default=Void(),
+        description='Material modifier (default: Void).'
+        )
+
+    dependencies: List[
+        Union[Void, 'Plastic', 'Glass', 'BSDF', 'Glow', 'Light', 'Trans']
+    ] = Field(
+        default=[],
+        description='List of modifiers that this modifier depends on. '
+                    'This argument is only useful for defining advanced modifiers '
+                    'where the modifier is defined based on other modifiers '
+                    '(default: []).'
+        )
+
+
+class Plastic(ModifierBase):
+    """Radiance plastic material."""
+
+    type: constr(regex='^plastic$') = 'plastic'
+
+    r_reflectance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the red channel reflectance '
+                    '(default: 0).'
+    )
+
+    g_reflectance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the green channel reflectance '
+                    '(default: 0).'
+    )
+
+    b_reflectance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the blue channel reflectance '
+                    '(default: 0).'
+    )
+
+    specularity: float = Field(
+        default=0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the fraction of specularity. '
+                    'Specularity fractions greater than 0.1 are not realistic. '
+                    '(default: 0).'
+    )
+
+    roughness: float = Field(
+        default=0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the roughness, specified as the '
+                    'rms slope of surface facets. Roughness greater than 0.2 are '
+                    'not realistic (default: 0).'
+    )
+
+
+class Trans(Plastic):
+    """Radiance Translucent material."""
+
+    type: constr(regex='^trans$') = 'trans'
+
+    transmitted_diff: float = Field(
+        default=0,
+        ge=0,
+        le=1,
+        description='The fraction of transmitted light that is transmitted diffusely in '
+                    'a scattering fashion (default: 0).'
+    )
+
+    transmitted_spec: float = Field(
+        default=0,
+        ge=0,
+        le=1,
+        description='The fraction of transmitted light that is not diffusely scattered '
+                    '(default: 0).'
+    )
+
+    @root_validator
+    def check_sum_fractions(cls, values):
+        """Ensure sum is less than 1."""
+        trans_diff = values.get('transmitted_diff')
+        trans_spec = values.get('transmitted_spec')
+        r_refl = values.get('r_reflectance')
+        g_refl = values.get('g_reflectance')
+        b_refl = values.get('b_reflectance')
+        identifier = values.get('identifier')
+        summed = trans_diff + trans_spec + r_refl + g_refl + b_refl
+        assert summed <= 1, 'The sum of the transmitted diffuse and specular light ' \
+            'fractions cannot be greater than 1, but is {} for modifier {}.'.format(
+                summed, identifier)
+        return values
+
+
+class Glass(ModifierBase):
+    """Radiance glass material."""
+
+    type: constr(regex='^glass$') = 'glass'
+
+    r_transmissivity: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the red channel transmissivity '
+                    '(default: 0).'
+    )
+
+    g_transmissivity: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the green channel transmissivity '
+                    '(default: 0).'
+    )
+
+    b_transmissivity: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the blue channel transmissivity '
+                    '(default: 0).'
+    )
+
+    refraction_index: float = Field(
+        default=1.52,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the index of refraction '
+                    '(default: 1.52).'
+    )
+
+
+class BSDF(ModifierBase):
+    """Radiance BSDF (Bidirectional Scattering Distribution Function) material."""
+
+    type: constr(regex='^BSDF$') = 'BSDF'
+
+    up_orientation: List[float] = Field(
+        default=(0.01, 0.01, 1.00),
+        min_items=3,
+        max_items=3,
+        description='Vector as sequence that sets the hemisphere that the BSDF material '
+                    'faces. (default: (0.01, 0.01, 1.00).'
+    )
+
+    thickness: float = Field(
+        default=0,
+        description='Optional number to set the thickness of the BSDF material '
+                    'Sign of thickness indicates whether proxied geometry is '
+                    'behind the BSDF surface (when thickness is positive) or in '
+                    'front (when thickness is negative)(default: 0).'
+    )
+
+    function_file: str = Field(
+        default='.',
+        min_length=1,
+        max_length=100,
+        description='Optional input for function file (default: ".").'
+    )
+
+    transform: str = Field(
+        default=None,
+        min_length=1,
+        max_length=100,
+        description='Optional transform input to scale the thickness and reorient '
+                    'the up vector (default: None).'
+    )
+
+    bsdf_data: bytes = Field(
+        ...,
+        description='BSDF xml file data as bytes.'
+    )
+
+    front_diffuse_reflectance: List[float] = Field(
+        default=None,
+        min_items=3,
+        max_items=3,
+        description='Optional additional front diffuse reflectance as sequence of '
+                    'numbers (default: None).'
+    )
+
+    back_diffuse_reflectance: List[float] = Field(
+        default=None,
+        min_items=3,
+        max_items=3,
+        description='Optional additional back diffuse reflectance as sequence of '
+                    'numbers (default: None).'
+    )
+
+    diffuse_transmittance: List[float] = Field(
+        default=None,
+        min_items=3,
+        max_items=3,
+        description='Optional additional diffuse transmittance as sequence of '
+                    'numbers (default: None).'
+    )
+
+    @validator('front_diffuse_reflectance')
+    def check_front_diff_value(cls, values):
+        """Ensure every list value is between 0 and 1."""
+        assert all(0 <= v <= 1 for v in values), \
+            'Every value in front diffuse reflectance must be between 0 and 1.'
+        return values
+
+    @validator('back_diffuse_reflectance')
+    def check_back_diff_value(cls, values):
+        """Ensure every list value is between 0 and 1."""
+        assert all(0 <= v <= 1 for v in values), \
+            'Every value in back diffuse reflectance must be between 0 and 1.'
+        return values
+
+    @validator('diffuse_transmittance')
+    def check_diff_trans_value(cls, values):
+        """Ensure every list value is between 0 and 1."""
+        assert all(0 <= v <= 1 for v in values), \
+            'Every value in diffuse transmittance must be between 0 and 1.'
+        return values
+
+
+class Light(ModifierBase):
+    """Radiance Light material."""
+
+    type: constr(regex='^light$') = 'light'
+
+    r_emittance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the red channel of the modifier '
+                    '(default: 0).'
+    )
+
+    g_emittance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the green channel of the modifier '
+                    '(default: 0).'
+    )
+
+    b_emittance: float = Field(
+        default=0.0,
+        ge=0,
+        le=1,
+        description='A value between 0 and 1 for the blue channel of the modifier '
+                    '(default: 0).'
+    )
+
+
+class Glow(Light):
+    """Radiance Glow material."""
+
+    type: constr(regex='^glow$') = 'glow'
+
+    max_radius: float = Field(
+        default=0,
+        description='Maximum radius for shadow testing (default: 0). Surfaces with zero '
+                    'will never be tested for zero, although it may participate in '
+                    'interreflection calculation. Negative values will never contribute '
+                    'to scene illumination.'
+    )
+
+
+# Required for self.referencing model
+# see https://pydantic-docs.helpmanual.io/#self-referencing-models
+ModifierBase.update_forward_refs()
+Plastic.update_forward_refs()
+Glass.update_forward_refs()
+BSDF.update_forward_refs()
+Glow.update_forward_refs()
+Light.update_forward_refs()
+Trans.update_forward_refs()
+