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---
title: specularConstant
slug: Web/SVG/Attribute/specularConstant
page-type: svg-attribute
browser-compat: svg.elements.feSpecularLighting.specularConstant
---
{{SVGRef}}
The **`specularConstant`** attribute controls the ratio of reflection of the specular lighting. It represents the k<sub>s</sub> value in [the Phong lighting model](https://en.wikipedia.org/wiki/Phong_reflection_model). The bigger the value the stronger the reflection.
You can use this attribute with the following SVG elements:
- {{SVGElement("feSpecularLighting")}}
## Example
```css hidden
html,
body,
svg {
height: 100%;
}
```
```html
<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
<filter id="specularLighting1" x="0" y="0" width="100%" height="100%">
<feSpecularLighting in="SourceGraphic" specularConstant="1.2">
<fePointLight x="60" y="60" z="20" />
</feSpecularLighting>
</filter>
<filter id="specularLighting2" x="0" y="0" width="100%" height="100%">
<feSpecularLighting in="SourceGraphic" specularConstant="0.8">
<fePointLight x="60" y="60" z="20" />
</feSpecularLighting>
</filter>
<rect
x="0"
y="0"
width="200"
height="200"
style="filter: url(#specularLighting1);" />
<rect
x="0"
y="0"
width="200"
height="200"
style="filter: url(#specularLighting2); transform: translateX(220px);" />
</svg>
```
{{EmbedLiveSample("Example", "420", "200")}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>{{cssxref("number")}}</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>1</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Description of Phong reflection model on Wikipedia](https://en.wikipedia.org/wiki/Phong_reflection_model)