The 4KK bulbs are designed to replicate the light spectrums found in Professional Grow Farm equipment. 4KK Bulbs are Warmer in appearance and have added benefits for Plants in the latter stages of the life cycle. Indoor grow bulbs have a low heat signature & are built with Rough Service LED Technology making them perfect for all your growing needs. With a versatile standard shape, Miracle LED Grow Lights are a must have for any economical indoor gardener. Images shown are for packaging and display purposes only. They are representative of the species or genus of plants that may be grown with artificial LED light. Results vary by many factors and artificial lights do not fully replace light from the sun.