I agree 100% with Ray that you mist the air and not spray the plant. I wasn't very specific, sorry.
I use humidifiers. In the room where most plants are under lights I use an ultrasonic, while in the kitchen window area, where it's a bit cooler, I use a warm-air unit. In both cases the output doesn't go directly to the plants, but, like a mister, to the air. I don't know how much it matters to your plants and how they're sitting, but it's also important, as you raise humidity, to raise air movement. Phals really like air movement, while still air can be a breeding "ground" for bacteria and fungi.
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