I found a great tip on the Hurom website. I assume this would apply to any slow juicer. It said "Alternate carrot with apple for more moisture and better extraction." I'm going to guess that lemon would work the same way, but apple and carrot would be a tasty juice as well.
Keep in mind that carrots are on the dry side and don't produce as much juice as other veggies. It will take a lot of carrots to get a lot of carrot juice. And whatever you do, don't try to re-juice the pulp. You will clog your juicer. Yes, I tried it. The pulp from the Hurom is already dry. I don't know what I was thinking.
Again, the Hurom has a small chute. Harder veggies need to be cut smaller so they don't get stuck in the machine. It does take a bit more prep to use a Hurom, but I love the feel of the juice compared to the centrifugal juicer. It's very smooth. It's worth the extra effort it takes to cut the carrots. Or if you're making a lot, you can run the carrots through the slice blade on your food processor. The slicing blade is also very handy for making sauerkraut.
Carrot Juice With Lemon and Ginger
I can't remember how much this makes
1 5lb bag of carrots
knob of ginger to taste
Juice all ingredients and store in a glass bottle until ready to serve.