Apply Image in LAB Question

I am presently taking the The LAB Frontier course by Dan Margulis at Kelby Training and I am having difficulty with the Apply Image command working the way Dan said it would. I am using CS3 on an PC.
Dan makes extensive use of this command in sharpening and other functions as follows:
Be in LAB color mode.
Start with a Background layer and duplicate.
Oversharpen Layer 1.
Have Layer 1 selected and go to Apply Image.
Apply the lower layer Lightness channel to the top layer reducing opacity to 50%.
CHANGE THE MODE TO DARKEN. This is my problem as Darken is not an available choice.
I have tried this on two different PCs with the same unfavorable result. Does anyone have an idea why Darken mode is not available to me?

This is interesting to me because I had never explored "Apply Image". Didn't even know it was there. But playing with it, I was able to invoke ALL of the blend modes in LAB, provided I used the Lightness channel exclusively.
Exclusively means that BOTH target and source are confined to the Lightness channel.
"Target" and "Source" are introduced for flexibility in the Apply Image command. They allow you to blend two layers not necessarily one on top of the other as in the usual blend operation. In Apply Image, the Source acts like the top layer, so it is the layer for which you designate the blend mode.
Here's what to do: Open two images. Put both in LAB mode. For whichever is the target, go to the channels palette and deactivate the a and b channels, leaving only the L channel active. Then invoke Image>Apply Image. In the dialog box that comes up, choose the other open image as the Source and, if it has layers, designate which one you want to use in the blend . Select the L channel. Now select a blend mode for this source. You will find, SURPRISE, that ALL blend modes are availble to you (no longer are some, like Darken or Lighten, grayed out).
Again, what is new to me is that Apply Image affords a convenient way to blend layers from disparate sources rather than being confined to having them in the same image AND one on top of the other. Works well in RGB also, and there you don't have to restrict the channel to access all blend modes. In LAB mode, restricting operations to the Lightness channel in order to access some of the blend modes requires a touchy procedure which, if not followed, leaves these modes still frustratingly grayed out.

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