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Old 03-15-2013, 09:52 PM
MEXANDME MEXANDME is offline
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Vista Bullet Explodes / Desicant Pack?

I installed some Vista 2216 Halogen Bullets a few days ago. At the advise of some on this board, I placed a small (1 Gram) desicant pack in each light (down at the bottom of the spring).

Tonight I discovered one of the fixtures totally destroyed! It looked like it had exploded; the portion that the lens cover fits over was broken away from the base, the lens cover was about 8 feet away from the fixture, the lens cover even had a chunk missing out of the side of it, and the desicant pack was open with no granuals to be found.

Has anyone experienced this, can the desicant pack explode, or was it just whacked by something else? It is located in a mulched bed so there has been no lawn maintenance equipment anywhere near it.

What are your opinions????

Thanks,

Mex
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Old 03-16-2013, 01:59 AM
dglights dglights is offline
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Incompatibility with other substances: May react violently or explosivley with strong oxidiers such as fluorine,chlorine trifluoride, oxygen dichloride, manganese trifluoride.
Mixtures of magnesium with wet silica gel exploded violently. May react with burning sodium. Reacts with xenon hexa fluoride to form explosive xenon
trioxide.
Reactivity: Avoid excessive heat, generation of dust, moisture, all incompatible materials.

Mex you may have a bad combo of the magnesium in the aluminum reacting with moisture and pack.
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Old 03-16-2013, 10:42 AM
steveparrott steveparrott is offline
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Fascinating, Sherman may be right. Also, a quick google search finds that some dessicant explodes when soaked in water (rather than just swells) - though it's hard to imagine enough force created by this to cause the damage here.

I also find that most dessicant is de-activated at temperatures exceeding about 350F. Internal fixture temperatures can easily exceed that.

If a chemical reaction was the cause, in addition to Sherman's thought about Mg from the Al, there is significant outgassing from some types of grease used in sockets - this can be seen as fog deposited on the inside of the lens.

And, Sherman mentioned reactions with Xenon - that, of course, is a gas used in some halogen lamps - if the lamp capsule cracked - boom!
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Old 03-16-2013, 11:36 AM
MEXANDME MEXANDME is offline
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Thanks for the feedback!

I installed 56 lights on this project with the 1 GM desicant packs.

Since this project is really close to my home, I will continue to monitor them on a daily basis and if another one goes "boom".............I guess I will have my answer.

Any additional thoughts will certainly be welcomed!

Regards,

Mex
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Old 03-16-2013, 11:39 AM
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Classic Lighting Classic Lighting is offline
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I agree with what the others have said. However, why do you need to install these packs? Is the fixture not waterproof?
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Old 03-16-2013, 11:57 AM
steveparrott steveparrott is offline
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This is why we don't seal our directional lights - they can breath through the knuckle and stem, or shroud assembly. This allows the expanding hot humid air to escape when the fixture is lit, so when the fixture cools, there is less moisture inside the fixture - hence, less condensation to corrode internal parts.

A fixture that is completely sealed (moisture trapped in the fixture) goes through a continuous evaporation/condensation cycle that results is far more corrosion. In fact, standard laboratory tests for corrosion put test samples through this exact same scenario - repeated cycles of heating and cooling (in humid air)to accellerate the effects of condensation corrosion.

Our early experiments with completely sealed fixtures, and observations of corrosion in sealed fixtures confirmed this for us.
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Old 03-26-2013, 03:09 PM
Viewpoint Viewpoint is offline
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Occam's Razor tells me it was kids with a baseball bat. Though, exploding dessicant is more exciting.
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Old 03-26-2013, 11:07 PM
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INTEGRA Bespoke Lighting INTEGRA Bespoke Lighting is offline
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I wish there was a "Like" button here. Good one Andy.
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Old 03-28-2013, 07:43 PM
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starry night starry night is online now
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You guys have too much intellect and sophistication for me. I had to google Occam's Razor. I probably should not have confessed my ignorance but instead chimed in with lex parsimoniae.
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