LESS CSS Drop Shadow "Generator" mixin

Ever needed a neat way to generate drop shadow using LESS? Here's a simple mixin for that

// boxshadow mixin from www.herlitz.nu
.boxshadow(@horizontalOffset: 0, @verticalOffset: 0, @blur: 10px, @color: #000, @opacity: 0.8, @spread: 0, @inset: false ) {
    @red: red(@color);
    @green: green(@color);
    @blue: blue(@color);

    & when (@inset = true) {
        -webkit-box-shadow: inset @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
        -moz-box-shadow: inset @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
        box-shadow: inset @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
    }

    & when (@inset = false) {
        -webkit-box-shadow: @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
        -moz-box-shadow: @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
        box-shadow: @horizontalOffset @verticalOffset @blur @spread rgba(@red, @green, @blue, @opacity);
    }
}

Usage examples

<div>
    <div class="test-box my-box1">my-box1</div>
    <div class="test-box my-box2">my-box2</div>
    <div class="test-box my-box3">my-box3</div>
    <div class="test-box my-box4">my-box4</div>
    <div class="test-box my-box5">my-box5</div>
</div>

.test-box {
    width: 150px;
    height: 50px;
    margin: 50px;
    background-color:#ddd;
    text-align: center;
    line-height: 50px;


    &.my-box1{
        .boxshadow();
    }
    
    &.my-box2{
        .boxshadow(@spread: 3px, @blur: 15px);
    }
    
    &.my-box3{
        .boxshadow(@horizontalOffset: 3px, @verticalOffset: 7px);
    }

    &.my-box4{
        .boxshadow(@inset: true);
    }
    
    &.my-box5{
        .boxshadow(@color: blue, @opacity: 1, @blur: 15px, @spread: 1px);
    }
}