Photopia Beginner Tutorial

Beginner Tutorial 1 – Importing with the Luminaire Import Wizard
Below you can see a 2-lamp fluorescent luminaire design created in SolidWorks. This tutorial will show how to import this model into Photopia

Beginner Tutorial 2 – Analyze a Luminaire
Once a 3D luminaire model is inside Photopia and its materials are assigned, it is ready to be analyzed.
Photopia allows you to specify a range of settings that control the analysis process and also dictate the type and format of the photometric output produced. The following sections lead you through the details of specifying the photometric output and raytrace settings. Before starting, choose
Help > Open Sample Project and find 2×4 Fluor Troffer.ray, if it is not already open from Tutorial 1.

Beginner Tutorial 3 – Designing a Revolved Reflector with the Parametric Optical Design Tools
This tutorial will lead you through the process of creating a round symmetric downlight that achieves a particular candela distribution. The design will have the following parameters:
Use a 70W ceramic metal halide lamp
6″ diameter opening
1.2″ diameter hole for the lamp
Have a 45cutoff angle to the center of the arc tube
Make as wide a beam as possible with as even of an illuminance pattern as possible

Overview of Design Process
This tutorial will use the Revolved reflector tool. This and the other design tools are premised on the idea that the final desired candela distribution is the result of a reflector that aims the right amount of light toward each angle within the distribution. Therefore, the problem that needs to be solved is determining the portion of the reflector that is aimed toward each angle in the distribution. The Parametric Optical Design Tools facilitate the design process by creating optics comprised of multiple sections, with each section aimed at an angle within the limits of the distribution. Each reflector section is then linked to a weighting factor that determines the size of the section, the size being defined as some fraction of the total area allocated for the reflector.

The process begins by first specifying some general parameters about the optic, including:
1. The construction plane in which the 2D profile of the design will be created
2. The lamp position within the construction plane
3. The start location of the reflector profile (either end can be used as the start location)
4. The total angular extent of the reflector (this is generally an estimate at the beginning of the
process)
5. The angular limits of the designed beam pattern

Beginner Tutorial 4 – Designing a Fresnel Lens with the Parametric Optical Design Tools
This tutorial will lead you through the process of creating a round prismatic lens, referred to as a Fresnel lens. The design will have the following parameters:
Use a narrow beam LED source
Acrylic for the lens material
50mm diameter lens
3mm minimum lens thickness
Be designed to make as narrow a beam as possible

After designing the lens as defined above, we will investigate the different functions of the lens tool that allow us to make quick adjustments to the design’s parameters. These are the changes we will make to the lens:
Change the diameter from 50mm to 60mm
Change the location of prisms from only the outside surface to both outside and inside surfaces to only the inside surface
Use pull direction and draft angle to make the prisms mold-able
Add fillets to the prisms
Change from a stepped profile type to a smooth profile type

Overview of Design Process
This tutorial will use the Revolved lens tool. The light distributions of the lens tools are controlled via the same aiming angle and weighting factor concept used for reflectors. The general concept behind the lens tools is to create a prismatic surface, with the prisms “mapped” to a profile (base profile), which is the general shape of the lens. The aiming and weighting factors simply dictate the number of prisms aimed toward each angle in the distribution. Since there are two surfaces required for a lens, an inside surface into which the light enters the lens, and an outside surface through which the light exits the lens, the base profile is used for one of these surfaces and the prisms are mapped to a second surface, offset from the first.
The process begins by first specifying some general parameters about the optic, including:
1. Whether the lens will be revolved, extruded and mirrored (symmetric), extruded and not mirrored (asymmetric) or extruded along a path
2. The base profile to which the prisms will be mapped
3. The lamp location
4. The aiming specifications given by the aiming angle for the start of the base profile, the end of the base profile, and the aiming angle increment
5. The material index of refraction
6. The number of prisms to be used in the lens
7. Parameters specific to the revolved or extruded surfaces
Given this general information, Photopia will create a 3D lens comprised of multiple aiming sections of prism steps, each aimed at different angles within the desired beam limits. The number of sections (or the angular steps between the aiming angle for each section) is defined by the user. Different candela distributions are created by changing the weighting factor (and thus the number of prisms) of each aiming section. The process of weight adjustment to create a smooth light pattern is identical to that of a reflector,which is covered in Beginner Tutorial 3. In this tutorial, we will use only one aiming section (by aiming all prisms to 0°) and focus on parameters that are specific to lenses.

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