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Uber lighting: 25 HID heads mounted to my handlebars.
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Note: the following is a CONJECTURE, and I cannot say that it is correct. It is an educated guess only.
Here's a conjecture as to why MR bulbs last so much longer than flashlight-style HPR halogens. The HPRs have just one glass shell covering the filament. If it leaks due to age or whatever reason, say thermal cycling, the bulb is toast. MR style bulbs, OTOH, have a second cover that I am guessing is airtight too. So it would take TWO leaks before oxygen would enter the chamber with the filament and kill the bulb. This conjecture is supported at least by a comparison of rough lifetimes. HPR - 50 hours. 50 squared (assuming equal seal quality) = 2500, and incidentially, MR bulbs often have lifetimes around that value. If leaks are the main killer of halogen bulbs, then this conjecture would make sense. |
Originally Posted by Ngchen
(Post 5951092)
Note: the following is a CONJECTURE, and I cannot say that it is correct. It is an educated guess only.
Here's a conjecture as to why MR bulbs last so much longer than flashlight-style HPR halogens. The HPRs have just one glass shell covering the filament. If it leaks due to age or whatever reason, say thermal cycling, the bulb is toast. MR style bulbs, OTOH, have a second cover that I am guessing is airtight too. So it would take TWO leaks before oxygen would enter the chamber with the filament and kill the bulb. This conjecture is supported at least by a comparison of rough lifetimes. HPR - 50 hours. 50 squared (assuming equal seal quality) = 2500, and incidentially, MR bulbs often have lifetimes around that value. If leaks are the main killer of halogen bulbs, then this conjecture would make sense. |
I've read that Halogens are most stressed during turn on due to the inrush current. Anecdotal evidence here would seem to support that. I've also read about soft starts for MR16s/11s, has anyone tried that? I'm in the process of throwing together a DIY MR16 system and I think i'll incorporate a soft start.
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Originally Posted by Pig_Chaser
(Post 5954066)
I've read that Halogens are most stressed during turn on due to the inrush current. Anecdotal evidence here would seem to support that. I've also read about soft starts for MR16s/11s, has anyone tried that? I'm in the process of throwing together a DIY MR16 system and I think i'll incorporate a soft start.
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