What does it mean? I'm looking at LED replacements for the lights in my car (festoon, wedge, neo wedge etc.), and I see 'High Power' LEDs listed alongside the standard ones. I'm assuming it's not just another name for 'High intensity', because I was specifically advised against using High Power LEDs in the car. Why was that?
Past experience has taught me that the term "high power" is a relative thing. An LED replacement light might appear to be really bright to the eye when you test it in your hand with a battery, but it might be much less bright when it's in it's fixture in the car. This is partly due to the fact that the LED is a tiny point source of light which appears as a pinprick of light to your eyes, making it appear to be very bright, but only for that tiny area where the chip die is centered. The actual amount of light thrown forward, when spread out to it's normal beam pattern in an automobile fixture, might be much less than you expected.
The only LED replacements that I've found useful thus far have been the panel arrays that replace the overhead dome lights.
I've been awaiting suitable LED replacements for the standard 3157 turn signals and brake lights, but I have yet to obtain one that cuts the mustard.