Non-dimmable BR30 LED grow light lasts up to 25,000 hours and is red spectrum enriched for budding and flowering. Ratedfor high humidity use. Emits more light in the useful 450nm blue and 655nm red spectrum than regular white LED bulbs. Instant on to full brightness. UL/CUL Listed, FCC Compliant, Mercury free. 5"H x 3.75"D.