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Video instruction for installing the headlight/tail light combo. There have been a lot of questions about this.
Buy here: https://www.velomobileshop.com/products/led-headlight-new?variant=11681643651
For those looking for a good place to start to add some lighting to your Sondors, I can highly recommend Blackburn's 2'Fer pack of USB rechargable lights with a rubber clasp.
The lights have 4 modes on each light, bright white, blinking bright white, bright red, and blinking bright red. I found that the bright white mode is actually brighter then my old headlight from my other bike. So I've converted over to these on both bikes. I get a large amount of light in either red or white mode and they last long enough for most any ride. Plus since they charge via USB, it's easy to plug them in to charge be it via a USB port or even a pocket charger for your phone.
I aim my front light down just a bit so I can see everything around me and the front tire, then use my front light to illuminate everything coming up as I ride. The rear light is bright enough that it makes everything on both sides of me glow so I am very visible. These run around $45 USD for a pair, a fare price IMHO to be seen!