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Author Topic: Aquarium Bulbs  (Read 11131 times)

Offline northlights

  • New Member!
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  • Posts: 1
Aquarium Bulbs
« on: April 12, 2006, 12:22:49 pm »
Subject: Aquarium bulb

Hi, would you be able to tell me what the light blue powder is in an
PennPlax or Hagen Gro bulb. They are used for plant growth in aquariums.
I think the blue color blocks out the yellow light that plants do not
like. It is not fluorescent, it is incandescent, about 5 inches cigar
shaped, screw in type.? Unfortunately I broke one on the floor the other
day, swept it up and then vaccummed the tiny bits. Because it was
incandescent I didn't think about Mercury but I began to wonder? What is
this powder? Can you help? Thanks Doug

Offline mr_big

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Re: Aquarium Bulbs
« Reply #1 on: January 15, 2007, 06:01:36 am »
that is simply it a blue powder designed to block yellow light couldn't be a fluorescent as they need mercury and a ballast