Bulb Life on Metal Halides - The Planted Tank Forum
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post #1 of 2 (permalink) Old 04-10-2006, 12:04 PM Thread Starter
Algae Grower
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Join Date: May 2005
Location: Melbourne, Australia
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Bulb Life on Metal Halides

I'm running Metal Halides on my tank and was wondering if the colour temperature of the lamps deteriorates over time like flourescents?

Do they maintain the same colour temperature throughout their life?


145G (550l), 4x150W 5000K MH, Laterite in Gravel, DIY Substrate heating, Pinpoint pH controller, Pressurised CO2, DIY Reactor, 300W heater, Ehiem.
Vallisnera Spirallis, Giant Vallisnera, Microsorum Pteropus, Vesicularia dubyana, Echinodorus Bleheri, Anubia, Crytocoryne Balansae
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post #2 of 2 (permalink) Old 04-10-2006, 01:06 PM
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They do get reduced in intensity and colour temperature over time, and I have seen this first hand at my two tanks and at other's tank right here. Mine was initially white and turns a bit yellowish now. The intensity also decreases a bit than when new (instantly intense bubbling after MH is on back then).

It can go on for as long as 1-2 years before dying out, that is if you are still happy enough with the colour and quality. It is important to avoid any hot start as that will decrease the life of the bulb.
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