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Details Philips Son-T-Plus Lamps Product Details: Philips Son-T-Plus Sodium Lamps are extremely high quality sodium bulbs that produce slightly more lumens than standard models and last much better than the competition. On average son-t-plus design bulbs like this philips will produce 3 to 4% more light than a standard sodium bulb design which will increase your potential yields by the same factor. So although they cost more using phillips designed son-t-plus lamps in your growing environment could net you a higher yield to justify their expense. Philips Son-T-Plus Lamps will fit any reflector with an E40 lamp holder and require a ballast that matches the wattage of your lamp to safely start it.