You can use an Adjustment Layer. That will affect every layer below it. If that doesn't work for your purposes, you can create an Action, and use it on every layer you need to change. But remember that that will apply the identical effect each time.
A tip for the future, notice the tagline up top:
INTELLIGENT WORK FORUMS FOR COMPUTER PROFESSIONALS
A post like "Hey Guys, First Post, w00t! I Need A Shortcut For editing 1500 layers" is incongruous with this idea.
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