Halogen Brake Light Bulb Replacement

DesignTech 50 Watt Halogen 1156 Brake Light Bulb

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I also realized that halogen bulbs are famous for their heat output.  I'm not an engineer, but it makes sense that more power means more light...and more heat!  So I decided to get scientific.  I purchased a Pyrex "Professional" digital thermometer (at Bed, Bath and Beyond no less!) with a remote probe.  I hope you appreciate the money I blow on this stuff! I know my wife sure doesn't........

Before I checked to see how bright the halogen bulb was, I wanted to see how hot it burned.  I figured it wouldn't make any difference how bright it was if the taillight housing was melting into the fender as I stood at a stoplight. So I mounted each of 3 bulbs: the LEDtronics 1156, a standard GE long life incandescent, and the DesignTech halogen. 

I was going to measure the temperature inside the taillight housing with each bulb, but that proved to be too difficult to get the probe and everything lined up consistently.  So I went for the gusto -- I measured the temperature right at the bulb at 1 minute and 2 minute intervals.  I don't know about where you live, but around here in D.C. the stoplights can last as long as 3-4 minutes, which seems like an eternity.  I figured I'd test for about the worst case -- the longest you might have the brake lights continuously applied.  Here's the results:
 

 
After 2 minutes of testing the halogen, I started to smell something burning.  I quickly turned off the ignition and checked the chrome plated plastic taillight reflector.  Yep, some black burn marks above and below the bulb.  I don't know about you, but 314 degrees F is way too hot for me!

I then took some photos of the lighted bulbs.  While photos don't do justice to lighted brake lights, I think you get the idea.  These are original photos taken for this test; they are not the same photos used in the webBikeWorld LEDtronics LED bulb test. 

The results correspond with the LEDtronics test though; the LED bulb in Photo 1 looks weaker than the standard incandescent bulb in Photo 2.  The halogen is a bit brighter in Photo 3, somewhat noticeable towards the right and left edges of the lens. 

However, it's not really all that much brighter -- certainly not "2-1/2 times brighter", as claimed on the box, and not what you think you might get from a bulb that was 29 more watts than the standard bulb.  This backs up what my eyes saw -- I was pretty disappointed in the brightness of the halogen.  From they hype on the box, I was expecting to have to whip out my sunglasses, but that's not really the case at all.

Photo 1: LED	Photo 2: Incandescent	Photo 3: Halogen
The camera was mounted on a tripod; lens height 58" and distance from the back of the reflector was exactly 8'.

So what's the bottom line? My feeling is that the extraordinary heat of the halogen bulb could easily damage a motorcycle taillight lens assembly.  And while there is some difference in brightness, it's not enough to justify the risk.  Also, my experience with halogen bulbs in household lamps tells me that they are very fragile.  I'm not sure this bulb would handle the vibration of a motorcycle.  It may be alright for use in a car's backup light, where the bulb is rarely lighted for more than a few seconds, but not as a brake light.  The search continues......