Edit in JSFiddle

<div class="contenedor">
Efecto Brillo con CSS3
<div class="conte_imagen">
 <img src="https://lh3.googleusercontent.com/-VpplI1o__1c/UXQBmto1SFI/AAAAAAAAFdg/Dl0LwQafi9o/s278/anuncio.jpg" />
 <div class="activa_hover"></div>
</div>
<div>

.contenedor {
    width: 278px;
	margin: 20px;
    color: #000406;
    font: italic 18px Georgia;
    text-align: center;
}
.conte_imagen{
    width:  278px;
    height: 231px;
    margin: 30px auto;
    position: relative;
    border:4px solid #999;
}
.activa_hover{
    width:100%; 
	height: 100%; 
    background-image: url(https://lh3.googleusercontent.com/-vxQwquqFF0w/UXP-87VRPyI/AAAAAAAAFdM/g8PlNuj5oXg/s500/brillo.png);
    position: absolute;
    /*posicion de la imagen*/
    background-position: -265px 0; 
    left:0px; top:0px; 
    background-repeat:no-repeat;
    /*comenzamos transicion*/
    -webkit-transition: background-position .3s ease;
       -moz-transition: background-position .3s ease;
         -o-transition: background-position .3s ease;
            transition: background-position .3s ease;
}
.activa_hover:hover{
    /*posicion hover de la imagen*/
    background-position: 160px 0;
}