SPO Bulb Sod 600W 347V Greenpower (Special Order) Philips SPO Bulb Sod 600W 347V Greenpower (BUSD6347)Plant growth (photosynthesis) is not determined by lux or energy, but by the photons from the blue to red (400-700 nm) part of the spectrum. This is called growth light! For horticulture, natural daylight (global radiation) is in most cases measured in terms of energy (J orW) with a solar meter. This meter is generally positioned ... — Ships from HF: OR, CA, CO, PA, TX, FL USA.* Special Order - can take 2-6 weeks to ship, cannot be canceled or returned....more info.