how to add rel to link in cakephp

to show light-box
<a href="images/image-1.jpg" rel="lightbox">
<img src="images/thumb-1.jpg" width="100" height="40" alt="" />
</a>
i use this code to show images in lightbox instead the above code ..
$full = '/img/images/image-1.jpg';
$thumb = $this->Html->image('images/thumb-1.jpg');
echo $this->Html->link($thumb,$full,array('escape' => false));

already i show images (thumb and full screen) but i didn't show the
popup effect because i don't know how to add rel="light-box" to the
link

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