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There are too many options to answer a question such as this accurately. I would design the lighting scheme to suit each situation.
I would use different LED lighting applications from 3 watts to 10 watts, dependant on area size, locatoin, display content and budget.
3 Watt and regularlly 7 Watt as per colors requirments in the shops.
if i am not miss interpretting the type you have asked, it must be 3/4 watt but not more than 1 watt.