How to Test a Simple LED With the Button Battery?

If you buy some leds ,you can't confirm what's the leds color ,how to get it. A easy way is to test them use button battery.
we have took several photo for the problem,it's good used at the family .


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    Jackyhubble

    6 years ago on Introduction

    the similar them products is as below,
    With star leds.please note this. the products link.
    http://www.powerledworld.com/en/high-power-3w-star-led-index-1.html