Think you mean dimmer. Normally for planted tank still using the standard cool white light @ 6000nm to 7000k range wavelengths
You can also add the very popular plant grow led : red @ 660nm to 680nm or blue @ 380nm to 480nm range wave lengths.
To go cheap for plant grow leds you also can get the normal 630nm red and 470nm blue led.
For 660nm deep red leds or 450nm royal blue leds will cost more..
Depend your tank size and depth. There are led wattage range from 0.5watt, 1watt, 3watt, 5watt, 10watt or more per leds
If your tank depth are deep. 3watt or more per leds are better
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