Lumatek 600W HPS 400V BulbLumatek 600W HPS 400V Bulb High Efficiency 400V Lamp for Flowering The Lumatek 600W HPS 400V lamp is a high performance 400V high pressure sodium lamp designed for serious indoor growers. With a red rich 2000 Kelvin spectrum, this lamp delivers more PAR light, better efficiency, and more stable output than traditional 240V lamps. It is ideal for driving heavy flowering, bud density, and higher yields in medium sized indoor setups. Key Features 2K Red