That would depend on the wattage of your lamps used and your personal tastes. There's no hard and fast rule for this type of thing.
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You can safely put 48 regular (incandescent) 40 watt lights on a 20 amp circuit. If at some future date you might place higher wattage lights in the circuit, you will want to limit the number of lights to 20.
As many as the watts or current the dimmer specs say it will control - less 10 percent
The are many companies online from which one could purchase red LED lights such as Amazon, Super Bright LEDs, and RadioShack to name a few. There are also other sites that specialize in these types of lights for beauty therapy treatment such as Hollywood Beauty Secrets, and Trueskin in the UK.
The voltage needs to be known to give an answer to this question.