H4 100/80W High Wattage Bulb, 12V

First, be aware that no automobile or motorcycle sold in the United States has, stock, a wiring harness and headlight switch capable of surviving these bulbs. You *will* eventually burn out your headlight switch on your turn signal stalk, which *will* cost major dollars to repair -- *unless* you buy or build a heavy duty relay harness for your headlights. Furthermore, even if your headlight switch survives, it is quite likely that you will melt the light bulb socket down at the headlight unless you've replaced it with a heavy duty high temperature one, both due to the high amperage caused by voltage drop in too-small stock wiring and due to the simple fact that these bulbs put out more heat. The end result is that a simple light bulb change will turn into a trip to your local NAPA store to get a high-temperature socket, then a lot of cursing as you cut off the old socket (and bulb) and wire in a new socket. With that aside: I have used these bulbs in two Jeep Wranglers (using H4 conversion kits with heavy duty relay wiring harnesses) and two motorcycles (using a custom relay kit and harness that I built myself). They are as bright as stock reflectors are capable of handling. They do make more heat than stock bulbs, thus I recommend them only in glass enclosures, not in plastic ones. My Kawasaki motorcycles had a glass enclosure, and the Hella H4 conversion kits I used on my Jeeps have glass enclosures too. My Suzuki motorcycle had plastic enclosures so I used the Phillips X-Treme Power bulbs in that one instead. That said, the Phillips X-Treme bulbs are quite a bit more expensive than these bulbs and last about the same amount of time. If your car or motorcycle is properly set up to use these, they're a lot cheaper than the X-Tremes and put out a little more light. They're great bulbs, all in all. Just don't think you can put them into a stock wiring harness without a problem -- you *will* eventually burn something out or melt something.

H4 100/80W This bulb would be a god sent for motorcycles, only if it came in the fog/french yellow too... The low beam is properly positioned, quite bright and whiter than I expected from an incandescent. The high beam is also properly positioned, the mirror seems to focus it just like a DOT 60/55W bulb, no funky blinding patterns or wide spread beam as experienced with some LEDs. My intent was a brighter low beam and I am satisfied... I have tried a number of LEDs and it is comparable in luminosity/visibility. With LEDs I was not satisfied with the high beam as my mirror would not properly focus the beam, so I kept using 60/55W after testing 3-4 brands, the high end models. This 100/80W does not suffer from that. It is considerably brighter than a regular 60/55W, in fact some white road signs seem to reflect back almost too much light... It may be distracting at first.. It does not seem to heat up in a ridiculous manner. In theory it should put out ~60% more heat and light than the typical H4 so check your equipment after a few uses if it has completely enclosed headlights... For setups that keep both low and high beams ON, double check the values of the fuses as it may blow the typical 10Amps... Divide wattage consumed by the volts supplied to find the amps required for the fuse. 100W/12V=8Amps, 80W=7Amps, both ON = 15 (in reality the voltage is between 13.4-14V for a running motor, I don't know at what voltage the fuses are measured) Also, if possible degrease the bulb before installation w/ acetone, isopropyl alcohol, contact cleaner, etc, as oily spots on glass create hot spots. Be safe, have fun.

These bulbs helped, a LOT. I'm an old guy, and my aging eyes need all the help they can get when I drive at night. These Hella 100/80W H4 bulbs are BETTER than the TRS Mini-D2S HID Projector Retrofit I had installed previously. The Hella bulbs give you full spectrum TRUE white lighting that helps you see everything, and the stock headlight housing puts the light where it's supposed to go, down the road. I have a set of TRS 3Five ballasts and Mini D2S projectors sitting in my shop cabinet ... I am NOT going to re-install them, not going back to that poorly prioritized TRS HID D2S projector lighting pattern with stupid blue tint from TRS HID capsules and stupid amounts of just-in-front-of-the-bumper foreground lighting. It's for sale, cheap. My vehicle's headlight wiring does get a tiny bit warm with these Hella 100/80W H4 bulbs in use, as does the headlight lens, but it's just that ... warmer, not hot. Will probably build a thicker gauge wiring harness (12 AWG wiring) to see what these Hella 100/80W H4 bulbs can really do , as the stock 18 AWG wiring in my vehicle is probably choking these a little in terms of voltage drop and current limitations from the thin stock wiring. Even with that electrical slowdown from the stock wiring, these Hella 100/80W H4 bulbs still illuminate noticeably better than stock 60/55W H4 bulbs. Gave them 5 stars for longevity, as I have no reason to downgrade them (high performance bulbs tend to last a bit less than regular bulbs), but if they don't last a year, I'll be back with a revision to the review. Very pleased with the increase in illumination while maintaining a useable beam pattern. Win win.

brightness 🔆 Good

The product is different from the product shown in the website. Its not the original one instead a duplicate one.

Bad product

Good

Bulb did work ok, but totally inadequate packing! There was no foam protection on the bulb itself and bulb had come out of the box which was flatterned in an only very slightly padded envelope. A miracle it worked