Simple userscript to make it easier to set the color for RGB bulbs using Hubitat.

Hubitat RGB Color Picker.user.js

// ==UserScript==
// @name         Hubitat RGB Color Picker
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  introduce a color picker for RGB bulbs
// @author       Josh VanderLinden
// @match        http*://*/device/edit/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let colorMaps = $("input[type=hidden][value=COLOR_MAP]");

    // proceed no further if no color map fields are detected
    if (!colorMaps.length) {
        return;
    }

    function setColor(input) {
        return (hsva, instance) => {
            const h = (hsva.h / 360 * 100).toFixed();
            const s = hsva.s.toFixed();
            const l = (hsva.a * 100).toFixed();
            const v = `[hue:${h},saturation:${s},level:${l}]`;

            input.value = v;
        }
    }

    function applyColor(tile) {
        return (hsva, instance) => {
            tile.click();
        };
    }

    function addColorPickers(colorMaps) {
        return () => {
            colorMaps.each((idx, el) => {
                const colorMap = $(el);
                const input = colorMap.siblings("input[type=text]")[0];
                const tile = colorMap.parents("div").siblings("div.tile")[0];

                // create the color picking widget
                const picker = $("<span/>").insertAfter(colorMap);
                input.pickr = new Pickr({
                    el: picker[0],
                    position: 'top',
                    appendToBody: true,
                    defaultRepresentation: 'HSVA',

                    default: '#0090ff',

                    components: {
                        preview: true,
                        opacity: true,
                        hue: true,

                        interaction: {
                            hsva: false,
                            input: false,
                            clear: true,
                            save: true
                        }
                    },

                    onChange: setColor(input),
                    onSave: applyColor(tile)
                });

                // populate initial color map
                input.pickr.options.onChange(input.pickr.getColor());
            });
        };
    }

    // inject dependencies--stylesheet must come before javascript
    $("<link/>", {
        rel: "stylesheet",
        href: "https://cdn.jsdelivr.net/npm/pickr-widget/dist/pickr.min.css"
    }).appendTo(document.head);

    $.getScript(
        "https://cdn.jsdelivr.net/npm/pickr-widget/dist/pickr.min.js",
        addColorPickers(colorMaps)
    );
})();