Headlight hijinks

How many paragraphs does it take to change a lightbulb?




A weekend or two ago, I went for a nice motorcycle ride with a friend, and he made some comments about being visible on the road, being that riding a motorcycle is dangerous, and the factor he chose to bring up being the imperfect awareness of the other cars on the road. To partially combat this, he suggested that I ride with my high beams on in the daytime, for visibility.

When I got home, I pulled in to the garage, and noticed something off about the cardboard box that was a couple inches in front of where I park the bike - it wasn’t lit up by my headlight. My headlight was off. This isn’t immediately surprising, because there was still plenty of daylight out. Of course I would have my lights off. So, why was this weird? Because with motorcycles, you can’t turn the headlights off1. When you turn the bike on, the light is on. I believe the theory is that you’d be more visible as a rider if your headlight is on. This was probably a lot more effective before daytime running lights became common in cars. In practice, most A-pillars are thicker than my thighs and drivers are on their phones - the headlight is like a pitting a coughing baby against a nuclear bomb. Regardless, I don’t mind the always-on headlight, but it means you don’t think about switching on or off the lights.

So, the headlight had died, but I could still flick my high beams on. However, I wasn’t going to go around searing the eyeballs of other cars on the road in lieu of fixing the problem. Since the high beams still worked, I figured the low-beam fuse, or bulb, had blown. However, when I looked up replacement bulbs, and information about my bike, I learned that it’s just one physical bulb contains both the high beam and low beam light, and also one fuse for all the headlights. Now, having seen these ridiculous2 claims of a ‘single bulb to rule them all’ and this dual-filament nonsense, I proceeded to employ the ’trust, but verify’ strategy. (I was going to have to open up my headlight anyways.)

With an 8mm socket wrench (and the unnecessary turning of a phillips head screw that’s also accessible from the outside of my headlight assembly) I was able to inspect my bulb. It turns out, there are indeed, two filaments inside the bulb. One is surrounded by a spoon-shaped reflector to focus the light into the normal, dont-blind-other-drivers mode, and the other filament was surrounded by nothing. It was relatively hard to see what was wrong with the non-functional low-beam filament, so I was concerned that it could be a fuse - or more troublesome to repair - the wiring. Being optimistic, I just just worked on getting a replacement bulb.

The Philips H4 bulb I took out of the bike, held in my hand. It has a burnt out filament.

If you look closely, the low beam filament looks ‘dirty’ or ‘rusted’, and there’s a crack somewhere in the middle of the spiral section.

Seeing the text on the bulb say it’s a ‘H4’ bulb was helpful, because I found replacements online - but I really wasn’t finding that much. Some digging later found that ‘H4’ bulbs are equivalent to (much easier to search for online) ‘9003’ bulbs. It’s the same socket, the same wiring, but numbering schemes for headlights that came from different markets. 9003 is the American term, and H4 is the European term.

They sell LED bulbs that fit this socket, but it’s illegal in the US to put LED lights in a fixture that was designed for halogen bulbs. There would be a risk that my lights would shine and dazzle oncoming drivers. It’s funny, considering I already feel dazzled - and not positively - by the irritation of the (stock) LEDs on new cars. To refer back to my other Reagan quote (trust, but verify), one might notice that the NHTSA hasn’t changed regulations on vehicle lighting hasn’t been adjusted since Reagan was in office, yet somehow, these eye-searing LEDs have seemingly trickled down to everyone. If I wanted LEDs, I could buy a whole new LED fixture, but this was much more expensive, and these units advertise themselves with features such as having a bluetooth connection so that an app on your phone can change the color of some of the lights embedded within. This feature set didn’t really speak to me, so I stuck with a plain old bulb replacement.

Having figured out what replacement bulb to look for, I was spoiled for choice at my local Autozone. A brand called ‘Sylvania’ offered 4 different trim levels for my specific bulb socket! The internet seemed to recommend the ‘Silverstar’s, but two of the trims have ‘Silverstar’ in their name. Anyhow, the lineup is Basic, Xtra-vision, Silverstar, and Silverstar Ultra. Basic is basic. They make it feel somewhat cheap, as the packaging is downright barren, at least compared to the higher level bulbs, which all feature bolder colors, a lot more writing, and even a glowing sun-like shape to make the item feel like it’ll be brighter. Xtra-bright’s claim is that it goes farther downroad, at least, compared to their basic trim. Silverstar makes the light whiter, which is a mixed bag. It’s more modern looking, but the whiter color is achieved by adding a blue tint to the glass around the bulb. I was just interested in a good bulb, and making it blue for blue’s sake didn’t seem like something I’d bother paying for. Lastly, Silverstar Ultras claim even more brightness, increasing their downroad throw distance, and some claim of ‘Ultra’ night vision.

Being a muppet, I picked the second tier - the Xtra-brights - because I liked the idea of more brightness, but didn’t want a blue-tinted light.

I installed them, which wasn’t so bad, except for the H4 socket that was basically glued to the existing bulb. I wouldn’t have been surprised if it was the bulb it came with off the factory line. I got the two bulb and plug separated only by sticking a flathead screwdriver in the gap between the bulb and the socket, and twisting until it separated. It slightly chewed up the bulb and socket, but nothing else was working.

I don’t regret the Xtra-brights because of their brightness, or their price - both of which were perfectly fine. The light’s great, and the price difference was negligible. It was $23 instead of $20 for a single bulb, and for something that should last ‘a while’, that’s nothing. But, right there is the catch. What’s ‘a while’?

When I looked at the back of the packaging the bulb I bought - after I installed it and used it - I saw that the rated runtime was listed at 160 hours. The packaging claimed that the typical motorcyclist will put 100 hours in the seat a year, so this should last a year and a half or so. This seems pretty lame for longevity, so I checked the rated runtime for the ‘Basic’ bulb. The common saying goes that a brighter light burns out quicker, so I’d figure the relatively dimmer ‘Basic’ bulb would last a bit longer. How much longer? A cool 1,110 hours.

I paid 15% more for a light that has an 86% shorter lifespan.

I will have to replace this bulb 9 years earlier than if I had saved $3.

Oh well. I suppose I’ll be forking over another $20 in a year or so, and I think I’ll just go with the basic bulb by then.




1 For motorcycles sold in the US, made after 1976, this is generally true. The bulk of the online discussion about always-on motorcycle lights focuses on 3 countries: Australia, the UK, and the US. In Australia, always-on lights were required in the early 1990s and made optional a few years later, because the sun is bright down under, and motorcycle wiring was weak back then. In the UK, they don't have a law explicitly requiring it, but if your motorcycle came with always-on lights, and you change that behavior in any way, you'll fail your inspection. Since most bikes come with it stock, it's effectively a law for the end customer, instead of the manufacturer. In the US, Wikipedia is not very clear about if the law requires it, because the law itself is not very clear - it is a mix of the Federal 571.108 standard, and a hodgepodge of state laws implementing a variety of always-on light legislation. Like the UK, it's a common denominator system. Ask GM why it introduced daytime running lights for US-spec cars in the mid 1990s - it wasn't because of US regulation - it was because of neighboring Canada's regulation. GM cleverly advertised this, saying 'We think it's the right thing to do', but it was ironically a cost saver, as they could make one car the 'commond denominator' for both markets.

2 Sarcasm