Lifespan of MH bulbs for plant growth

TT, zone 5b MAJuly 25, 2006

Hi all -

I am so glad I found this forum!

I have two grow lights. Ones is running a 600W Sunmaster Cool Deluxe MH Conversion Bulb, the other a 1000W BT37 Sunmaster Blue Burning Metal Halide Lamp. I ran them last fall - winter - spring for tropical and subtrop bonsai and succulents for about 2500 hours overall.

When have they reached the end of their useful lifespan for plants? I was thinking about replacement - but do I need to do that yet?

Thanks very much in advance!


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shrubs_n_bulbs(z8/9 UK)

Tricky choice. There is no set time when they are no longer useful. The light intensity drops steadily throughout the life of the bulb, by up to 40% by the time it finally gives out. You can use it on plants the entire time, but it will still be using the same amount of electricity while it gives out less light. Most people swap out the bulbs at around a third or a half of their rated life, which would be about 5,000 hours, but there is nothing magic about this time. The cost of extra bulbs is more than offset by the savings in electricity by only using the bulbs at their most efficient.

    Bookmark   July 26, 2006 at 3:58PM
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TT, zone 5b MA

Thanks for the reply! I am thinking about picking up replacements for the indoor season, to have them on hand in case...

From your experience, would you recommend different bulbs (brands and color)? I have heard a bit about Philips Ceramic White MH bulbs (Not sure I have that name right) - any opinion on those vs. the Sunmaster bulbs I am using?

Thanks again!


    Bookmark   July 26, 2006 at 9:50PM
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jwmeyer(Z8 OR)

I think your talking about the Philips Ceramic Metal Halide. I use it in 400w and love it. Personally I think it's the best HID light on the market right now. It's available in watts up to 400....

    Bookmark   August 22, 2006 at 10:53PM
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