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| Alternative oven interior lamps? |
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| jogri:
--- Quote from: james_s on February 25, 2020, 03:25:15 am ---Next is probably a tie between excessive vibration and excessive voltage. --- End quote --- Hmm, that could also be the cause if the oven fan has aquired an imbalance and isn't shock-mounted properly. |
| Electro Detective:
Fan blades may/will get sticky gunk build up, especially on the back where you can't see it, or get to it easily.. |O and any uneven imbalance and the weight of the gunk will cause vibration and noise, vibrations that don't do heated and or aging or a cheaply made globe filament any favors, halogens even less so. Fans with little or no easy access are a pain to scrape and clean properly without deforming them, but it's either get it done or blow money on a new one eventually after it has overworked itself to premature motor failure, add the cost of 'mystery globe fails' along the way too.. :horse: |
| thm_w:
--- Quote from: tooki on February 24, 2020, 04:45:48 am ---You realize the only reason we have moved away from incandescent bulbs for general illumination is because they waste 90+% of their energy as heat? And you realize that in an oven, that makes an incandescent bulb essentially 100% efficient? Using ANYTHING else makes zero sense. --- End quote --- Yes and no. Microwave ovens have started moving to LED bulbs. Regular ovens will move to LEDs at some point. Its just a matter of who can figure out how to implement them well (as nihaomike mentioned), design a high temperature LED, or can advertise it as a new unique feature and sell well. Using a higher efficiency (and therefor brighter, with the same given circuitry and wiring), makes a lot of sense when the lighting in most ovens is quite poor. Not to mention the downside of a single point source light, if you have it on the top, and have a tray, now all the light to the next level is blocked. |
| james_s:
I mean you could do it right now if you really wanted to. The double layer IR coated glass used for the oven door reflects a remarkable amount of heat back inside, the outer face of the glass is usually not too hot to touch while baking. An LED on a fan cooled heatsink behind a coated glass lens would probably be just fine. It would cost considerably more though for questionable gain. The bulb in my oven is the only incandescent lamp I can think of that I still have in service in my house. It's not used enough for energy to be an issue and I think I've had to replace it once in 10 years or so. |
| thermistor-guy:
--- Quote from: james_s on February 25, 2020, 03:25:15 am ---Halogen lamps do indeed fail more quickly if you run them too low. I remember back when those halogen torchier lamps were popular I often saw people leave them on dim for extended periods and the whole "bulb" would turn black in as little as a few hours. You'll probably extend the life if you drop the voltage slightly but if you go down too far it will get shorter. The bulb wall *must* reach sufficient temperature for the halogen cycle to work.... --- End quote --- The bulb wall must be hot enough (say over 250 deg. C) so that any condensed tungsten on the wall combines with the fill gas to form tungsten halide. The filament must be hot enough to dissociate the tungsten halide and reduce net evaporation from the filament. But if both constraints are met (i.e. halogen cycle is operating), increasing the filament temperature still further, say to 3400 K, will reduce its life. |
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