Hydrofarm Agrosun BUSUHL250HZAS 250-Watt Gold Halide Horizontal High O This halide horizontal bulb make plants grow their best Best all purpose growth and fruit/flowering light you can use Emits more of the red wavelengths than common halides Gold standard in plant growth lighting, and thousands are in use by satisfied gardeners worldwide Outperform common sodiums in 4-1/2-inch geranium test Spectrally enhanced halides provide the best all-purpose light for growth and flowering Emits more of the red wavelength than common halides Considered the Gold standard in plant growth lighting, with thousands in use by satisfied gardeners worldwide In a 4.5" Geranium test 45% More Flowers Produced, 25% More Axillary Branching! *Other crop types will vary in response