The lower Antelope Canyon is not as popular as the upper for two reasons. You don’t get much of the light beams, and it’s narrower to get around. But it’s longer, larger and more affordable than the tourist-friendly slot canyon. Better yet, it’s less crowded.
Here you pay $26 at the entrance, and walk your down to the small opening of the canyon. It’s a short 5 minutes walk and the entire tour is not time consuming; so a bottle of water should be sufficient. If you have a SLR camera, you will be granted with 2 hours visiting time and just tour the slot canyon at your own pace. Keep in mind that some areas of the Lower Antelope Canyon can be a tight squeeze with a large backpack and there are ladder to get around the corkscrew canyon.
Like the Upper, you will use a wide angle lens in Lower. I wouldn’t mind carrying an extra mid range zoomy with me. As for the light beam, both slots are better during the Summer. Try 11am-2pm for Upper and morning for Lower. We skipped the Upper on our visit due to light condition is not ideal this time of the year and cost of the private photography tour guide.