Author Topic: Why do coloured Metal Halide lamps have such short lifespans?  (Read 159 times)
Lightingguy1994
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Why do coloured Metal Halide lamps have such short lifespans? « on: July 10, 2018, 11:49:03 PM » Author: Lightingguy1994
Browsing my local light distributers website for curiosity I looked at their coloured metal halide lamp offerings. A red 175w Probe Start lamp was only rated for 5000hours and the green and blue versions were at 10000hours. Why is that ? These lamps are 40 or so each, Id get them but I don't have any real need since I plan to make full use of my lighting collection eventually
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Medved
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Re: Why do coloured Metal Halide lamps have such short lifespans? « Reply #1 on: July 11, 2018, 01:17:40 AM » Author: Medved
Quite a big factor is the low production volume of such lamps. That means all development costs have to be distributed over way less pieces.
That has three major consequences, all related to development costs:
First the lamps are significantly more expensive than their "mainstream" white counterparts
As second, to keep the cost under control, the development budget becomes quite limited, compare to the mainstream.
That means their development has no chance to fine tune the designs to such extend as common with the mainstream. So the design is way less optimal, so with many degrading effects not solved, or at least the limited reliability statistical data means all the reliability performance estimation to be way less accurate. So if a company wants to preserve their reputation, simple solution is to shift the published data to make sure the real performance would still meet them even when the estimation was off.
And latest, the used technology is way less advanced than what is common with the white mainstream. Again the reason is to save on the development cost, when some design already works in at least somehow acceptable way. So the designs are lacking the latest features normally used to improve the reliability (in the mainstream used to big extend to allow further production cost reduction).
Also the high volume production brings way more performance feedback data, what alows the design to be way better optimized even during production.

It is rue the lamp designs share as much as possible know-how from the existing mainstream production, but not all aspect work the same way, because just the mfill mix is different, so needs different conditions or has different impact on the inner structures. So even when they look very similar, they still require quite significant development work and that is very expensive.

It is the same mechanism, what causes similar observation in car industry:
The budget cars are build very cheap way, but they are extremely well engineered, so their design really uses all what is really possible from the limited production budget.
On the other hand he super luxury cars are looking nice, they are expesive, full of "high tech", but are full of design mistakes (wrong battery orientation, so the electrolyte is not properly mixed during car use, so the battery needs to be frequently replaced, corrosion weak spots, etc).
Again the main reason is, although the super luxury vehicles are more than 10x more expensive than the budget types, the development budget for the cheap ones uses to be way more than 10x larger than the budget available to develop the luxury "road yachts".
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Lightingguy1994
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Re: Why do coloured Metal Halide lamps have such short lifespans? « Reply #2 on: July 11, 2018, 04:51:00 PM » Author: Lightingguy1994
The cost of the lamps I was looking at are cheap for what they are, $40 Canadian for the 'Extra Value' as they call it brand ones. they also have USHIO in Magenta, Green, Blue and Orange with life of 6000 hours and each of those is $100 Canadian.

Could it be that the life is short because they are coloured? Perhaps 6000hours is the time the lamp is expected give a certain colour and after that the colour could change but still last for 1000's more hours ?
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HomeBrewLamps
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SodiumVapor 105843202020668111118 UCpGClK_9OH8N4QkD1fp-jNw majorpayne1226
Re: Why do coloured Metal Halide lamps have such short lifespans? « Reply #3 on: July 11, 2018, 07:00:39 PM » Author: HomeBrewLamps
Different fill mixtures react with the quartz walls differently... I assume some might have more corrosive elements in them.. Like Sodium...
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BlueHalide
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Re: Why do coloured Metal Halide lamps have such short lifespans? « Reply #4 on: July 11, 2018, 10:13:06 PM » Author: BlueHalide
The 6000-8000 hour lamp life given to colored metal halide lamps is due to exactly that, the average rated hours before the lamp's spectrum shifts significantly away from its intended saturated color, blue lamps in particular are the worst in maintaining that strong blue color, I have cheaper chinese blue lamps that burn pink or white after just several hundred hours of use. The "Extra Value" lamps you mentioned for $40 are almost certainly made by Plusrite or GMY, if thats the case, expect the "red" lamp to actually produce a pink/magenta color, the green will get whiter and whiter over time, and the blue lamps will invariably have a color temperature of 12,000K to 20,000K, expect these to turn whiter or pink/purple in short time.

The only quality colored metal halides on the market are Ushio, Osram/Radium, and Venture. These lamps all hold their color for at least their rated 6000 hours, but usually longer. I have a Ushio 400w magenta lamp thats done nearly 18,000 hours and its still pink.
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Lightingguy1994
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Re: Why do coloured Metal Halide lamps have such short lifespans? « Reply #5 on: July 12, 2018, 10:39:05 AM » Author: Lightingguy1994
I find that so interesting ow they change colour like that, I wish other types of lighting were as interesting as this. I would get them but I have no need for coloured ones
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