【 More darker the environment, More brighter the balloon. and you can take out the LED and remove the gauze/wrapping from it to make them brighter inside the balloon】 【Colorful Balloons and Colorful LED Light - Flashing】, and possible the LED balloons did not to fly. because the LED is so heavy. You need to fix it in someone place (trees, wall, roof or others) LASTS FOR HOURS FOR NON-STOP PARTYING: Inflate the balloons to 12 inches (30cm) with either helium (no helium tank required) or ordinary air, these decors will brightness up to 12 hours of continued use and remains cool to the touch. So, plan your event now and party from dusk till dawn! QUALITY LED LIGHTS: Each balloon features an integrated LED light that light up to 24 hours (maximum brightness up to 2 hours). These innovative Colorful Light up balloons are also great decoration for House Party, Birthday, Wedding, Christmas, Anniversary, Dance Club, Housewarming, Easter day, Valentine's Day, First Communion, Bachelorette Party, Baby Shower, Farewell Party, Superbowl Party, Oscar Party, Holiday Party, Theme Party, Graduation Party, 80's Party, Wine Party or any other special occasion worth celebrating. Product parameters:

Lighting duration: 20 - 24 hours
Maximum size when blowing: 12 inches / 30 cm
Packing unit: 50

Application scenario:

Glowing balloons are used in various festivals, parties, anniversaries and weddings.
In a dark environment, bright balloons are the most beautiful.
More darker the environment, More brighter the balloon.