Q: What is the difference between a BT-56 and BT-37 metal halide lamp

A: BT-56 and BT-37 correlate to the size of the glass envelope surrounding the actual arc tube of the lamp. BT-56 lamps are larger than BT-37 lamps and are commonly operated in a vertical orientation in parabolic style reflectors. BT-56 style lamps will not fit inside many horizontal reflector designs.

Q: How often should I replace my grow bulbs?

A: Whether fluorescent, sodium, or halide, we recommend to replace light system bulbs every 1 to 1.5 years if ran for a minimum of 12 hours per day. Although they may still ignite for multiple years, quality of light to the plants has degraded after this time of continuous use. The appropriate time to replace bulbs is at it’s “Economic Life” rather then the rated life. This is typically calculated at 60% of the bulb’s rated life.

Q: Should my HID lights hang vertical or horizontal for maximum penetration?

A: Studies have shown that a horizontal positioned bulb and reflector unit will provide superior light penetration compared to vertical orientation. However, both styles are acceptable for cultivation. Some bulbs are designed to be hung in horizontal position. This designation will be listed on the bulb as a “horizontal” position bulb. These bulbs should be hung in the horizontal position.

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Q: Can an HPS ballast be used to power a metal halide bulb?

A: This is never recommended, the ballast and bulb type (wattage and operation) must match. Convertible ballasts, however, can be switched between MH and HPS modes. There is also the option of using a conversion bulb, this is a special type of bulb which allows an HPS ballast to operate a MH bulb or visa versa.

What is the difference between an electronic ballast and a magnetic core and coil?

A: Electronic ballasts, also known as "digital", utilize a internal microprocessor that converts a higher efficiency of energy to the bulb using less power from the ballast. The result is a higher quality bulb life, and increased output of light.

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Q: Which bulbs are tuned on/off from the two on/off switches on the six tube T5 fixtures?

A: One switch operates the two center lamps (3,4)...and the other switch operates the four outside lamps (1,2,5,6).

Q: Is it a problem if water or water vapor gets on the top side of the T5 fixture?

A: There should not be a problem. The ballasts are sealed, and the lamps are protected from condensation from above.

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