Lightness.php

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<?php
#require_once 'Zend/Measure/Abstract.php';
#require_once 'Zend/Locale.php';

class Zend_Measure_Lightness extends Zend_Measure_Abstract
{
    const STANDARD = 'CANDELA_PER_SQUARE_METER';

    const APOSTILB                          = 'APOSTILB';
    const BLONDEL                           = 'BLONDEL';
    const CANDELA_PER_SQUARE_CENTIMETER     = 'CANDELA_PER_SQUARE_CENTIMETER';
    const CANDELA_PER_SQUARE_FOOT           = 'CANDELA_PER_SQUARE_FOOT';
    const CANDELA_PER_SQUARE_INCH           = 'CANDELA_PER_SQUARE_INCH';
    const CANDELA_PER_SQUARE_METER          = 'CANDELA_PER_SQUARE_METER';
    const FOOTLAMBERT                       = 'FOOTLAMBERT';
    const KILOCANDELA_PER_SQUARE_CENTIMETER = 'KILOCANDELA_PER_SQUARE_CENTIMETER';
    const KILOCANDELA_PER_SQUARE_FOOT       = 'KILOCANDELA_PER_SQUARE_FOOT';
    const KILOCANDELA_PER_SQUARE_INCH       = 'KILOCANDELA_PER_SQUARE_INCH';
    const KILOCANDELA_PER_SQUARE_METER      = 'KILOCANDELA_PER_SQUARE_METER';
    const LAMBERT                           = 'LAMBERT';
    const MILLILAMBERT                      = 'MILLILAMBERT';
    const NIT                               = 'NIT';
    const STILB                             = 'STILB';

    protected $_units = array(
        'APOSTILB'                      => array('0.31830989',   'asb'),
        'BLONDEL'                       => array('0.31830989',   'blondel'),
        'CANDELA_PER_SQUARE_CENTIMETER' => array('10000',        'cd/cm²'),
        'CANDELA_PER_SQUARE_FOOT'       => array('10.76391',     'cd/ft²'),
        'CANDELA_PER_SQUARE_INCH'       => array('1550.00304',   'cd/in²'),
        'CANDELA_PER_SQUARE_METER'      => array('1',            'cd/m²'),
        'FOOTLAMBERT'                   => array('3.4262591',    'ftL'),
        'KILOCANDELA_PER_SQUARE_CENTIMETER' => array('10000000', 'kcd/cm²'),
        'KILOCANDELA_PER_SQUARE_FOOT'   => array('10763.91',     'kcd/ft²'),
        'KILOCANDELA_PER_SQUARE_INCH'   => array('1550003.04',   'kcd/in²'),
        'KILOCANDELA_PER_SQUARE_METER'  => array('1000',         'kcd/m²'),
        'LAMBERT'                       => array('3183.0989',    'L'),
        'MILLILAMBERT'                  => array('3.1830989',    'mL'),
        'NIT'                           => array('1',            'nt'),
        'STILB'                         => array('10000',        'sb'),
        'STANDARD'                      => 'CANDELA_PER_SQUARE_METER'
    );
}