Controls:

• Rotate: Use a single finger on a touchscreen or the left click on your mouse
• Zoom: Use two fingers on a touchscreen or the wheel on your mouse
• Reset: Press number 5 to reset both the camera position and the object rotation.

Notes:

This viewer allows to visualize photometric data files written in IES format (.ies) and EULUMDAT format (.ldt). A photometric data file describes the intensity distribution (in candela) of the light source. The IESNA LM-63 (.ies) is the format prevalent in the United States of America. The specification is availbale : here. Version 2002 is supported. It should work for version 1995 too. The specifications for the EULUMDAT format are here. Various resources:

• Study on photometric data visualization based on IESNA LM-63 standard
• Photometric Testing
• All Things Lighting
• CIBSE TM14 File Format
• IES Library: a database for IES files
• IES Viewer: the free IES file viewer
• LDT Editor by DIAlux
• Real IES : an IES profile generator
• Ransen Lighting And Color - Blog
• Ransen Software
• OSRAM catalog of light sources

This three.js viewer was inspired by http://stemkoski.github.io/Three.js/ by Lee Stemkoski. The javascript code for the IES and LDT loader was adapted from here