General > General Technical Chat

Enclosed bulb hot environment, CFL or LED better

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Alex Eisenhut:
I feel like complaining about those corn cob LEDs sold as "microwave oven" bulbs for over-the-range models.
The bulbs are not only enclosed, but subject to extra heat and humidity from my sausages.
They don't last a year. They're brighter than incandescent bulbs but much more expensive.
I wonder why there can't be a reliable solution for this application. I hope new ovens have LEDs form the factory, because that little trap door arrangement SUCKS.

james_s:

--- Quote from: Rick Law on April 25, 2021, 07:29:23 pm ---I am of the same mind...  That they are lower wattage nominally should by itself has an impact.  The CFL's perceived lumens seem to drop fairly fast.  I could use a 480lm (40 watts) instead of a pair of 600lm (14

--- End quote ---

The lumen output depreciates pretty significantly in the first 100 hours, prior to which a reputable one should be producing more than the rated lumens. After that initial period they settle in and the output declines over a much more gradual curve.

joseph nicholas:
You did not mention if the original bulbs were the same as the proposed replacements.

Rick Law:

--- Quote from: joseph nicholas on April 26, 2021, 12:28:51 pm ---You did not mention if the original bulbs were the same as the proposed replacements.

--- End quote ---

I am currently on CFLs.  Attempted LEDs once about 3-5 years ago - they lost lumens rather quick.  When they went kaput I switched back to the CFL since.

Next round, I am going to switch to LEDs again hoping changes in the last 3-5 years made them better.  I am equipped with a lux meter these days, I will fix a "consistent way" to measure so I have an objective gauge rather than subjective recalled perceptions.

james_s:

--- Quote from: Rick Law on April 28, 2021, 01:36:29 am ---I am currently on CFLs.  Attempted LEDs once about 3-5 years ago - they lost lumens rather quick.  When they went kaput I switched back to the CFL since.

Next round, I am going to switch to LEDs again hoping changes in the last 3-5 years made them better.  I am equipped with a lux meter these days, I will fix a "consistent way" to measure so I have an objective gauge rather than subjective recalled perceptions.

--- End quote ---

Look for some that are rated for use in enclosed fixtures. Lumen depreciation should be negligible on a good LED bulb. About a year ago I took the Philips LED bulb that I installed in my porch light in 2011 and tried it side by side with a NOS identical lamp that never got used, they were indistinguishable. That porch light runs dusk till dawn 7 days a week, average around 12 hours a night.

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