# <feSpecularLighting>

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The `<feSpecularLighting>` SVG filter primitive lights a source graphic using the alpha channel as a bump map. The resulting image is an RGBA image based on the light color. The lighting calculation follows the standard specular component of the Phong lighting model. The resulting image depends on the light color, light position and surface geometry of the input bump map. The result of the lighting calculation is added. The filter primitive assumes that the viewer is at infinity in the z direction.

This filter primitive produces an image which contains the specular reflection part of the lighting calculation. Such a map is intended to be combined with a texture using the `add` term of the arithmetic `<feComposite>` method. Multiple light sources can be simulated by adding several of these light maps before applying it to the texture image.

## Usage context

Categories Filter primitive element Exactly one light source element first and any number of descriptive elements in any order.

## Attributes

### Specific attributes

• `in`
• `surfaceScale`
• `specularConstant`
• `specularExponent`
• `kernelUnitLength`

## DOM Interface

This element implements the `SVGFESpecularLightingElement` interface.

## Example

```<svg height="200" width="200" viewBox="0 0 220 220"
xmlns="http://www.w3.org/2000/svg">
<filter id = "filter">
<feSpecularLighting result="specOut"
specularExponent="20" lighting-color="#bbbbbb">
<fePointLight x="50" y="75" z="200"/>
</feSpecularLighting>
<feComposite in="SourceGraphic" in2="specOut"
operator="arithmetic" k1="0" k2="1" k3="1" k4="0"/>
</filter>
<circle cx="110" cy="110" r="100" style="filter:url(#filter)"/>
</svg>```

## Specifications

Specification Status Comment
Filter Effects Module Level 1
The definition of '<feSpecularLighting>' in that specification.
Working Draft Removed limitation of `specularExponent` attribute.
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of '<feSpecularLighting>' in that specification.
Recommendation Initial definition

## Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes4 Yes9 ?
`in` Yes Yes4 Yes9 ?
`kernelUnitLength` ? ? ? ? ? ?
`specularConstant` Yes Yes4 Yes9 ?
`specularExponent` Yes Yes4 Yes9 ?
`surfaceScale` ? ? ? ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? Yes Yes Yes ? ? ?
`in` ? Yes Yes Yes ? ? ?
`kernelUnitLength` ? ? ? ? ? ? ?
`specularConstant` ? Yes Yes Yes ? ? ?
`specularExponent` ? Yes Yes Yes ? ? ?
`surfaceScale` ? ? ? ? ? ? ?