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PS: how to add bulb? Step 1. cut out all 4 bulbs Step 2. glue the bulbs with colored face up. Step 2.5. make sure you have 2 double sided bulbs Step 3.cut a small line on the top of one the bulbs and cut a small in on the bottom of the other bulb Step 4. stack the bulbs on to each other by the lines you cut Step 4. use tape to attach the bulb