Single-ended or double-ended for HPS grow light скачать в хорошем качестве

Single-ended or double-ended for HPS grow light

Single-ended HPS bulbs:http://bit.ly/2lwSnWJ Double-ended HPS bulbs :http://bit.ly/2PB6A1n Single-ended (SE) high-pressure sodium (HPS) bulbs screw in like standard light bulbs, but into a slightly wider socket called a Mogul base. The glass bulb has an elongated shape that is wide enough to accommodate its inner components. Inside the bulb, an opaque inner tube contains the part that creates light, called the arc tube. The arc tube connects to the base of the bulb with a metal “frame wire” holding it up by each end. Double-ended (DE) HPS bulbs connect to the fixture on each end much like fluorescent tube bulbs. In this case, the inner, light-generating tube is supported by two small wires on each end of it and lacks a frame wire that crosses in front of the arc tube. Without any of the metallic structure that SE bulbs need to support the arc tube, DE bulbs are significantly thinner than SE bulbs. These bulbs also degrade slower than traditional, single-ended HPS bulbs. In fact, after 10,000 hours, double-ended lamps will still output approximately 90% of their original intensity. With the exposed arc tube, the bulb, without any metal framing in the way, increases light delivery to the canopy of your plants. The symmetry of DE bulbs allows you to create an even spread of light much easier than is possible with SE bulbs. Not only does the lack of wireframe improve on its light delivery and reflectance, the thinner bulb also improves its optical properties. DE bulbs, however, are not perfect. While SE bulbs are under vacuum, DE bulbs are full of nitrogen gas. The nitrogen atmosphere allows the bulb to operate at a higher temperature, which increases its efficiency. The downside of a gas-filled bulb is that the gas conducts heat from the outside of the bulb to the arc tube. Any air blowing directly on the bulb induces a temperature change in the arc tube, causing a loss in efficiency. Therefore, DE bulbs do not tolerate air blowing directly on them like in active cooling setups (aka “cool tubes” in which the SE bulb sits inside of a tube with a fan housed in the luminaire or lamp hood).