The send off

Glow sticks?

You could do glow sticks! Here's some other ideas from The Knot: https://www.theknot.com/content/amphtml/18-creative-exit-toss-ideas

LED balloons look really cool at night

View Quoted Comment Thank you!!

My FH and I met in part due to Star Wars, so we are having a jumbo glow stick send off as "lightsabers"! We also couldn't have flame and it will be dark as well for us, maybe look into something glowy?

We’re having our guests hold those little electric tea candles and toss lavender!

The LED balloons would be really pretty since it will be at night.
We are doing a rose petal toss for ours, but it is during the afternoon.

I had a friend do lanterns, but you have to get EVERYONE to help, but her pictures came out beautifully.

I am having a similar dillemma. I feel everyone always does sparklers, so I know I wanted to do something different. I originally wanted to do a paper lantern send off, but similar to balloons, they end up somewhere and turn into liter. I really like the tea light send off idea. Guests can keep them if they want, or could be returned to the venue for future weddings etc. What is the theme of your wedding? Romantic, ethereal, etcc.? That may help get some idea rolling too.

View Quoted Comment Rustic country

View Quoted Comment Hmm, what about fairy lights in Mason jars? Or those fireyfly string lights (the firefly is attached to each bulb) in Mason jars? It'll look like you caught jars of fireflies. I've attached some inspiration photos, and then of course you could get the warm yellow light so make it softer instead of white if you wanted.