http://www.thedoorlight.net/closet-door-light-switches/

Do you want the light in the closet when you open the door / OFF When closed.System has the power of magnetic switch.Use NO or NC? Thanks?
if the closet door is normally closed, the switch should be normally open.
How to Install a Magnetic On/Off Switch for LED Lights
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TRINE #340 DOOR SWITCH CLOSET LIGHT ON DOOR OPEN BRASS $24.99 |
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TRINE 340+342 SWITCH CLOSET LIGHT ON+DOOR OPEN+BRAS+NEW $24.99 |
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EDWARDS+CLOSET/LT+SWITCH #502A 120V+LIGHT ON/ DOOR OPEN $24.99 |
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GB PUSH BUTTON DOOR SWITCH -automatic closet light $19.99 |
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All-Purpose Indoor Electric Door – Closet Light Switch $14.99 |