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Old 02-12-2004, 03:31 PM   #11
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A few things to keep in mind:

This has been posted about 100 times on these forums:

Kelvin relates directly to the peak light wavelenght that a fully black object will emit when heated to that temperature not the spectrum the object produces when so heated. The spectrum will be more related to the object's molecular composition. While it is true that bulbs that are hotter (higher kelvin) lean toward the blue portion of the visible spectrum - that only applies for a limited section of the temperature range. In fact as the Kelvins go up the peak wavelenght cycles all through the spectrum in this order of wavelengths (ignoring wavelengths shorter than white) White, blue, violet, ultraviolet, Gamma rays etc. So it is not true to say that the higher the Kelvin the bluer the light because at some point it will become violet and then ultraviolet and then on past light radiation to very, very high frequency type radiation.

In fact 10,000 K bulbs produce a good deal of UV radiation and 20,000 K even more. There is a simple fomula for figuring out the peak wave length given Kelvin - I have posted it here a few times. A 20,000K bulb is actually going to be more violet than Blue when compared to the cooler 10,000k bulb

As for the actual color spectrum - this has more to do with a feature of artifitially created light called the CRI (color rendering index) where 100% is Mid-day sunlight.
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Old 02-12-2004, 05:56 PM   #12
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I believe it is either probe=magnetic and pulse = electronic, or they are both types of magnetic ballasts. Some bulbs require pulse start to fire. From everything I've read, electric ballasts will fire everyones bulb of the right wattage.
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Old 02-29-2004, 03:50 PM   #13
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One more question... can i put a 250w bulb in a 400w ballast? i want to get a MH for my tank, but am planning on upgrading in the future. it wont blow the bulb or anything will it?? thanks
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Old 02-29-2004, 07:05 PM   #14
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It won't work. You gotta use the properly sized ballast for the bulb.
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