Typically double ended lamps use shunted lamp holders although some of the new combo units use shunted or non shunted sockets.
Double ended light fixture.
The extra socket equates to extra brightness and therefore efficacy.
Double ended de grow lights have the positive and neutral sockets at each end of the fixture as opposed to the one socket on a single ended se bulb.
The extra socket equates to extra.
A double ended led t8 tube has line and neutral pins on each end of the lamp.
Designed with a low shadow footprint and for commercial levels of reliability.
A non shunted conversion is similar but slightly different.
The iluminar 750 600 de hps mh commercial fixture is a feature rich double ended high pressure sodium all in one fixture but one aimed at smaller footprint environments that still require the benefits of the double ended configuration over single ended e39 systems.
Since fluorescent linear lamps are typically double ended the installation of double ended lamps can be easier.
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Double ended de hps bulbs connect to the fixture on each end much like fluorescent tube bulbs.
According to light level measurement devices double ended lights are brighter and can cover larger surface areas in comparison to standard 1 000w light systems.
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Shunted socket differences are due to how electric current flows.
Higher ceilings are recommended for operating double ended lights so larger footprints may be achieved which could ultimately result in larger yields due to the increased growing area.