@kousa, I paid 20$ for a couple. It's 19,99 euros but in dollars it should be a bit more around 20 and something I guess.
@DavidLMO, thanks for your message. The lamps are on their way already, so I can't do anything else now. I don't know the wattage of these red/blue led lights. The wattage of the kitchen light is 100W (maybe too poor for plants but strong for a kitchen, I like it to be very illuminated).
