1. "dim" stock bulbs can be wire problem, clean/fix the fixtures, etc. Replacing w/ new bulbs/LEDs can hide problem for awhile.
2. Ebay is full of poor quality parts, and bit less problem at Amazon. This includes "Fulfilled by Amazon" products.
3. Watch "Color Temperature." White LED 4500°K or more can cause problem w/ Red lenses.
4. Too many LED versions to keep track what's good/bad.
See my Cave, Lighbulbs
, LED poisoning
and LED Marker Light
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)