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HTML

              
                <div class="debug">
	<p>HSL: <span class="hsl-swatch"></span><span class="hsl"></span></p>
	<p>Brightness: <span class="brightness"></span></p>
</div>

<div class="holder">
	<div class="inner">
		<div class="dial"></div>
		<div class="controls">
			<div class="color">
				<div class="handle"></div>
			</div>
			<div class="brightness">
				<div class="handle">
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
					<i></i>
				</div>
			</div>
		</div>
	</div>
</div>
              
            
!

CSS

              
                $size: 320px;
$dark: #000002;

body { background: $dark; font-family: Helvetica, Arial, sans-serif; }

*, *:before, *:after {
	box-sizing: border-box;
}

.debug {
	color: #fff;
	
	span.hex-swatch, span.hsl-swatch {
		display: inline-block;
		width: 15px;
		height: 15px;
		margin: 0 5px;
	}
}

.holder {
	width: $size;
	margin: 30px auto;
	
	.inner {
		position: relative;
		width: 100%;
		height: 0;
		padding-bottom: 100%;
		
		.dial, .controls {
			position: absolute;
			top: 0;
			left: 0;
			width: 100%;
			height: 100%;
		}
		
		.dial {
			z-index: 1;
			background-position: center;
			background-repeat: no-repeat;
			background-size: contain;
		}
		
		.controls {
			z-index: 2;
			pointer-events: none;
			
			.color {
				width: 4px;
				height: 25%;
				position: absolute;
				left: 50%;
				top: 0;
				z-index: 2;
				transform: translateX(-50%);
				background: $dark;
				
				.handle {
					width: 30px;
					height: 30px;
					background: #fff;
					position: absolute;
					left: 50%;
					transform: translateX(-50%);
					border-radius: 50%;
					top: 10px;
					pointer-events: auto;
					border: 3px solid #fff;
					box-shadow: 0 3px 10px 0 rgba(#000, 0.3);
				}
			}
			
			.brightness {
				//display: none;
				position: absolute;
				top: 25%;
				left: 25%;
				width: 50%;
				height: 50%;
				border-radius: 50%;
				z-index: 1;
				overflow: hidden;
				background-image: linear-gradient(-180deg, #66717D 0%, #4D5660 50%, #333B44 100%);
				border: 5px solid $dark;
				pointer-events: auto;
				
				&:after {
					content: '';
					display: block;
					position: absolute;
					top: 0;
					right: 0;
					bottom: 0;
					left: 0;
					border-radius: 50%;
					background-image: linear-gradient(-180deg, #66717D 0%, rgba(#4D5660, 0) 50%, #333B44 100%);
					pointer-events: none;
				}
				
				.handle {
					position: absolute;
					left: 0;
					right: 0;
					top: 0;
					padding: 50% 0;
					
					i {
						display: block;
						width: 20px;
						height: 2px;
						background: #CFCBC7;
						margin: 40px auto 0;
						
						&:first-child { margin-top: 0; }
					}
				}
			}
		}
	}
}

.handle {
    cursor: move;
    cursor: -webkit-grab;
    cursor: -moz-grab;
    cursor: grab;
	&:active {
		cursor: -webkit-grabbing;
		cursor: -moz-grabbing;
		cursor: grabbing;
	}
}
              
            
!

JS

              
                /**
 *
 * ----------------------------------
 * Inspired by the Lifx app
 * @see https://itunes.apple.com/us/app/lifx/id657758311
 * @author Levi Cole at Skape Collective
 * ----------------------------------
 *
 */
(function ($) {
	'use strict';

	$.fn.LifxColorPicker = function(options) {
		const self = this;
		options = $.extend(true, {
			hue: 0,
			saturation: 0.5,
			brightness: 1,
			size: 320,
			// Callback
			changed: function(color) {
				// color.hex
				// color.hue
				// color.saturation
				// color.brigtness
			}
		}, options);
		
		/**
		 * Public
		 * Color data
		 */
		self.data = {
			hue: 0,
			saturation: 0,
			brightness: 0
		};
		
		/**
		 * Private
		 * DOM data
		 */
		const dom = {
			rotation: 0,
			brightness: 0,
			saturation: 0
		};
		 
		
		/**
		 * Global DOM Elements
		 * @type {jQuery}
		 */
		const $this	= this;
		const $dial = $this.find('.dial');
		const $saturation_handle = $this.find('.color .handle');
		const $brightness_handle = $this.find('.brightness .handle');
		
		/*
		 * Canvas properties
		 */
		const canvas		= document.createElement('canvas');
		const context		= canvas.getContext('2d');
		
		canvas.width	= options.size;
		canvas.height	= options.size;
		context.scale(2, 2);
		
		/**
		 * Math variables
		 */
		const x		= options.size / 4;		// Canvas center X (divided by 4 because of retina)
		const y		= options.size / 4;		// Canvas center Y (divided by 4 because of retina)
		const r		= x;					// Canvas radius
		const d2r	= Math.PI / 180;		// Degrees to radians
		const r2d	= 180 / Math.PI;		// Radians to degrees
		const abs_x	= $dial.offset().left + (r * 2);
		const abs_y	= $dial.offset().top + (r * 2);
		
		/**
		 * Public
		 * Simple function to retrieve the current [H]ue [S]aturation [L]ightness
		 */
		self.hsl = () => {
			let round_sat = Math.round(self.data.saturation * 100);
			let h = self.data.hue;
			let s = 100;//round_sat;
			let l = Math.round(100 - (round_sat / 2));
			
			return 'hsl('+h+', '+s+'%, '+l+'%)';
		};
		
		/**
		 * Private
		 * Generate radial gradient image
		 */
		const generate_gradient = () => {
			
			for (let angle = 0; angle <= 360; angle++) {
				const arc_start	= -((angle + 90) * d2r);
				const arc_end	= -((angle + 88) * d2r);
				
				// Draw shape
				context.beginPath();
				context.moveTo(x, y);
				context.arc(x, y, r, arc_start, arc_end, false);
				context.closePath();

				// Generate gradient for shape
				let gradient = context.createRadialGradient(x, y, 0, x, y, r);
					gradient.addColorStop(0.5, 'hsl('+angle+', 10%, 100%)');
					gradient.addColorStop(0.75, 'hsl('+angle+', 100%, 70%)');
					gradient.addColorStop(1, 'hsl('+angle+', 100%, 30%)');

				context.fillStyle = gradient;
				context.fill();
			}
			
			$dial.css('background-image', 'url('+canvas.toDataURL('image/png', 1)+')');
		};
		
		/**
		 * Calculate mouse rotation relative to $dial center
		 * @param  int  mouse_x
		 * @param  int  mouse_y
		 */
		const get_degrees = (mouse_x, mouse_y) => {
			const radians	= Math.atan2(mouse_x - abs_x, mouse_y - abs_y);
			const degrees	= Math.round((radians * r2d * -1) + 100);
			return degrees < 0 ? 360 - Math.abs(degrees) : degrees;
		};
		
		/**
		 * Private
		 * Run when any values are changed
		 */
		const trigger_change = () => {
			
			let c_color	= self.hsl();
			let c_top	= ((1 - dom.saturation) * ($saturation_handle.parent().outerHeight() - $saturation_handle.outerHeight()) );
		
			
			// Update dial rotation
			$dial.css('transform', 'rotate('+dom.rotation+'deg)');
			
			// Update saturation handle
			$saturation_handle.css('background', c_color);
			$saturation_handle.css('top', c_top+'px');
			
			// Update brightness handle
			$brightness_handle.css('top', -(dom.brightness * $brightness_handle.height())+'px')
			
			// Send data to callback
			if (typeof options.changed === 'function') {
				let send_data = self.data;
				send_data.hsl = self.hsl();
				options.changed(send_data);
			}
		};

		/**
		 * Public
		 * Set Hue
		 */
		self.set_hue = (rotation) => {
			let hue = typeof rotation !== undefined ? rotation : self.data.hue;
			if (hue > 360) {
				hue = hue - 360;
			}
			if (hue < 0) {
				hue = 360 - Math.abs(hue);
			}
			
			// Set data values
			self.data.hue	= hue;
			dom.rotation	= hue;
			trigger_change();
		};
		
		/**
		 * Public
		 * Set saturation
		 */
		self.set_saturation = (saturation) => {
			saturation = typeof saturation !== undefined ? saturation : self.data.saturation;
			if (saturation > 1) { saturation = 1; }
			if (saturation < 0) { saturation = 0; }
			self.data.saturation	= saturation.toFixed(2);
			dom.saturation			= saturation;
			trigger_change();
		};
		
		/**
		 * Public
		 * Set brightness
		 */
		self.set_brightness = (brightness) => {
			brightness = typeof brightness !== undefined ? brightness : self.data.brightness;
			if (brightness > 1) { brightness = 1; }
			if (brightness < 0) { brightness = 0; }
			self.data.brightness	= brightness.toFixed(2);
			dom.brightness			= brightness;
			trigger_change();
		};
		
		/**
		 * Public
		 * Set color from Hue and Saturation
		 */
		self.set_color = (hue, saturation, brightness) => {
			self.set_hue(hue);
			self.set_saturation(saturation);
			self.set_brightness(brightness);
		};
		
		/**
		 * Dial rotate click and drag binding
		 */
		$dial.on('mousedown', function(event) {
			
			// Calculate the mouse position in degrees
			const start_degrees	= get_degrees(event.pageX, event.pageY);
			const start_dom		= dom.rotation;

			$(document).bind('mousemove', function(event) {
				// Calculate the mouse move position, removing starting point
				const end_degrees = get_degrees(event.pageX, event.pageY);
				let difference = 0;
				
				if (end_degrees < start_degrees) {
					difference = (end_degrees + 360) - start_degrees;
				} else {
					difference = end_degrees - start_degrees;
				}
				
				self.set_hue( start_dom + difference );
			});
		});
		
		/**
		 * Vertical color range click and drag binding
		 */
		$saturation_handle.on('mousedown', function() {
			$(document).bind('mousemove', function(event) {
				const $parent	= $saturation_handle.parent();
				const h_size	= $saturation_handle.outerWidth();
				const h_half	= h_size / 2;
				const p_size	= $parent.outerHeight() - h_size;
				const bounds	= $parent.offset();

				var y = event.clientY - (bounds.top + h_half);
				
				if (y > p_size) {
					y = p_size;
				}
				
				if (y < 0) {
					y = 0;
				}

				self.set_saturation( 1 - (y / p_size) );
			});
		});
		
		/**
		 * Brightness click and drag binding
		 */
		$brightness_handle.parent().on('mousedown', function(event) {
			var click_y	= event.clientY;
			const top	= parseInt($brightness_handle.css('top'));
			
			$(document).bind('mousemove', top, function(event) {
				const h_size = $brightness_handle.height();
				var y = top - (click_y - event.clientY);
				
				if (y > 0) {
					y = 0;
				}
				
				if (y < (-h_size)) {
					y = -h_size;
				}

				self.set_brightness( Math.abs(y) / h_size );
			});
		});
		
		/**
		 * Remove all click and drag bindings
		 */
		$(document).on('mouseup', function() {
			$(document).unbind('mousemove');
		});

		$(window).bind('mousewheel DOMMouseScroll', function(event) {
			if (event.target === $brightness_handle.parent()[0] || $brightness_handle.parent().has( event.target ).length) {
				const current_value = self.data.brightness * 100;
				let new_value = 0;
				if (event.originalEvent.wheelDelta > 0 || event.originalEvent.detail < 0) {
					new_value = current_value - 1;
				} else {
					new_value = current_value + 1;
				}
				new_value = new_value / 100;
				self.set_brightness( new_value );
				event.preventDefault();
				return false;
			}
		});
		
		/**
		 * Initiate
		 */
		generate_gradient();
		self.set_color(Math.round(options.hue), parseFloat(options.saturation), parseFloat(options.brightness));
		
	};

})(jQuery);

/**
 *
 * ----------------------------------
 * Initiate plugin
 * ----------------------------------
 *
 */

$(document).ready(function() {
	
	$('.holder').LifxColorPicker({
		changed: (color) => {
			$('span.hsl').text(color.hsl);
			$('span.brightness').text(color.brightness);
			
			$('span.hsl-swatch').css({
				'background': color.hsl,
				'opacity': color.brightness
			});
		}
	});
	
});
              
            
!
999px

Console