Action: myUSMdark+light
		Play action “CurrentImage” of set “CBsActions”
		Set current layer
			To: layer
			Name:  “Unsharpened”
		Duplicate current layer
		Set current layer
			To: layer
			Opacity: 66%
		Unsharp Mask
			Amount: 200%
			Radius: 1 pixels
			Threshold: 0
		Set current layer
			To: layer
			Opacity: 100%
		Duplicate current layer
		Apply Image
			With: calculation
			Source: RGB channel of layer “Unsharpened”
			Calculation: lighten
		Apply Image
			With: calculation
			Source: RGB channel of layer “Unsharpened”
			Calculation: subtract
			Scale: 1
			Offset: 0
		Desaturate
		Select layer “Unsharpened copy”
		Apply Image
			With: calculation
			Source: RGB channel of layer “Unsharpened”
			Calculation: darken
		Apply Image
			With: calculation
			Source: RGB channel of layer “Unsharpened”
			Calculation: subtract
			Scale: 1
			Offset: 255
		Desaturate
		Set current layer
			To: layer
			Opacity: 66%
			Mode: linear burn
			Layer Styles: layer styles
			Scale: 416.7%
		Select layer “Unsharpened copy 2”
		Set current layer
			To: layer
			Opacity: 66%
			Mode: color dodge
			Layer Styles: layer styles
			Scale: 416.7%
		Select layer “Unsharpened copy 2”
		Make adjustment layer
			Using: adjustment layer
			Type: curves
			Adjustment: curves adjustment list
			curves adjustment
			Channel: composite channel
			Curve: point list
			point: 0, 0
			point: 128, 128
		Group
		Set current layer
			To: layer
			Name:  “Lighten”
		Select layer “Unsharpened copy”
		Make adjustment layer
			Using: adjustment layer
			Type: curves
			Adjustment: curves adjustment list
			curves adjustment
			Channel: composite channel
			Curve: point list
			point: 128, 128
			point: 255, 255
		Group
		Set current layer
			To: layer
			Name:  “Darken”
		Select layer “Unsharpened copy”
		Set current layer
			To: layer
			Name:  “Dark diff”
		Select layer “Unsharpened copy 2”
		Set current layer
			To: layer
			Name:  “Light diff”
		Select layer “Unsharpened”
		Move current layer
			To: front layer
		Hide layer “Unsharpened”
		Select layer “Darken”

The Unsharpened layer is present for comparison or incase you want to cut it back in at a lower opacity.

Alter the Diff layers to reduce the sharpening.  The Diff layer opacity is set to 66%, in case you want to increase the effect.

Alter the Curve layers to control Threshold...
In the Lighten Curve, I have shifted the white point diagonally so that the brightest halos decrease, 
while the less intense sharpening artifacts elsewhere in the image are unaffected. 
To adjust the threshold effect slowly start clipping the black point by shifting the black point horizontally.

For the darkening layer, the procedure is reversed - shift the black point diagonally to get 
rid of any extremely dark halos, and shift the white point horizontally to adjust the 
threshold of the dark layer.