Here's what I have:

#declare pigmentR = pigment
{
	function {fR (fL(x,y,z),fC(x,y,z),fH(x,y,z))}
	color_map
	{
		[0 color srgb <0,0,0>]
		[1 color srgb <3,0,0>]
	}
}
#declare pigmentG = pigment
{
	function {fG (fL(x,y,z),fC(x,y,z),fH(x,y,z))}
	color_map
	{
		[0 color srgb <0,0,0>]
		[1 color srgb <0,3,0>]
	}
}
#declare pigmentB = pigment
{
	function {fB (fL(x,y,z),fC(x,y,z),fH(x,y,z))}
	color_map
	{
		[0 color srgb <0,0,0>]
		[1 color srgb <0,0,3>]
	}
}


isosurface
{
	function { fFinal (fL(x,y,z),fC(x,y,z),fH(x,y,z)) }
	threshold	0
	accuracy	0.01
	contained_by
	{
		box {<-1,0,-1>,<+1,+1,+1>}
	}
	max_gradient	20000
//	[evaluate P0, P1, P2]
//	open
//	[max_trace INTEGER] | [all_intersections]
	pigment
	{
		average
		pigment_map
		{
			[1 pigmentR]
			[1 pigmentG]
			[1 pigmentB]
		}
	}
}

However, the result is much to white on top, and there are no blues or 
greens whatsoever. I've attached the result of the render. Here's 
roughly what the colors are supposed to look like:

https://commons.wikimedia.org/wiki/File:Cielch_color_solid_cylinder.png

Mike

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Preview of image 'cielch_color_solid_cylinder_isosurface_2.png'