Abstract: A modular plant growing system may comprise two or more substantially vertical light panels, wherein each substantially vertical light panel may comprise one or more LED light engines. A support base may be attached directly or indirectly to each vertical light panel, wherein the support bases may be configured to engage with bottom surfaces of plant growing containers. Optional one or more top reflection panels may be configured to be disposed above the two or more substantially vertical light panels, the one or more top reflection panels may comprise reflection material and at least one ventilation opening. A plant growing space may be provided in the space defined by the two or more substantially vertical light panels and the one or more optional top reflection panels.