UPDATE - I can't blame the bulb 100% for this issue, but my snowmobile's headlight is now having excessive condensation. These LEDs are cold to the touch on the lighting side, so there is no heat to burn off this condensation. There were no problems with halogen lamps for obvious reasons. Now that I've been sitting with them for a while, they don't give off as good a radiation pattern as I initially thought. This is partly due to condensation and refraction. The color is much better than halogen, but condensation is a big problem at the moment. INITIAL REVIEW - I installed a BEAMTECH H4 50W 6500K 8000 Lumens LED headlight bulb on my 2012 Ski-Doo snowmobile with no great expectations. I've been using HID for 3 years now and the light output is amazing and the 6000K color is perfect for the snow. The HIDs I have are not well designed and no longer work as they should. I've had my eye on H4 LED bulbs for a long time, since they actually came out. While I have a feeling that the design of these latest H4 bulbs isn't perfect (read on), LED technology has improved a lot, so I decided to give it a try. If you are unfamiliar with the H4 high/low beam halogen bulb, it has 2 filaments. The low beam, which is closest to the tip of the lens, has a shutter (that metal cup) that only allows light to be projected up into the headlight reflector. The angle at which light hits the reflector is reflected down from the headlight assembly for the low beam circuit. The high beam filament is closest to the mounting flange. This illuminates 360 degrees, allowing light to hit the entire reflector that protrudes from the headlamp assembly (top and bottom) to form the high beam. The actual LEDs in most LED headlight bulbs glow on the sides rather than the top and bottom of halogens. The first picture shows the high beam from an H4 LED bulb, notice the shadow it casts. The light is not reflected in the headlight unit. 2nd photo - low beam, chrome "cups" very well eliminate a dark spot visible in the high beam. 3rd photo, if you look directly at the headlight (low beam) you can see the shadow in the reflector, 12 o'clock position. The power consumption of 1 H4 LED bulb was less than half an ampere after warming up. My biggest concern is the heat since it's fanless. After 20 minutes of operation, the heatsink reached 170 degrees Fahrenheit. The last 2 shots were taken across the driveway 50 meters away on 3 reflective signs. In the first photo, the high beam, the light is quite heavily concentrated in the center. The last picture is the low beam, which light pattern is wider and lower than the high beam. I took these pictures with the left and right light bulbs installed. I am planning to buy another set of H4 LED headlights for my wife's snowmobile, but a different brand just for comparison. I'll probably go for the fan version if it fits the space. I will update this over time.
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