Quake2's surface-based lighting is generally more natural looking than point light entities. Unfortunately, only its brightness can be modified with Qrad3. ArghRad provides new ways to extensively customize surface light appearance. One method is through tagged surface lights.

Light-emitting surfaces can be tagged to allow a separate light entity to control their properties. Note: This control light will still cast light of its own.


	_lighttag tag	location: light entity version: 2.50
	tag: surface light value	default: none
	Assigns a surface "ID tag" number to this light. All light-emitting surfaces with a matching light value will be controlled by this light. The tagged surfaces will then use this light's values for (if present): _color, _distance, _focus, light, _lightmin, and style. Also, if this light is triggered, the tagged surfaces will be set to the same trigger.
	no example image	example map


	_color r g b	location: tagged light entity version: 2.50
	r g b: standard rgb color	default: none
	Sets the rgb color of the tagged surfaces' lighting, overriding the original texture colors. Colors similar to the originals tend to look best.
	no example image	example map


	_distance units	location: tagged light entity version: 2.50
	units: >= 1	default: infinite
	Sets a cutoff distance at which the surface lights abruptly stop shining. It can be used strategically to speed compiling, and reduce "face with too many lightstyles" errors.
	no example image	example map


	_focus scale	location: tagged light entity version: 2.50
	scale: 0-1 (fade slower), > 1 (fade faster)	default: 1
	Scales how quickly the surface light fades as its cast-off angle decreases from perpendicular to parallel. Values less than 1 fade slower, spreading out more. Values greater than 1 fade faster, spreading out less.
	no example image	example map


	light brightness	location: tagged light entity version: 2.50
	brightness: any brightness	default: none
	Sets the brightness of the tagged surfaces' lighting, overriding the surfaces' own light values.
	no example image	example map


	_lightmin brightness	location: tagged light entity version: 2.50
	brightness: 0-255	default: 0
	Used only if this light entity has a _lighttag. This adds the specified brightness to the tagged light-emitting surfaces. This can make normally dim surface-lights appear to glow brighter.
	no example image	example map


	style lightstyle	location: tagged light entity version: 2.50
	style: standard lightstyle (0-31)	default: 0
	Sets the tagged surfaces' lighting to the specified lightstyle.
	no example image	example map