Getting Your Bathroom Mirror Defogger Right
There’s nothing more annoying than stepping out of a hot shower and staring at a wall of white fog. You can’t shave, you can’t do your makeup, and wiping it with a towel just leaves streaks everywhere. That’s where infrared (IR) lamps come in. They keep the glass warm enough so the steam never even lands. But here’s the catch: you can’t just throw any lamp behind the glass and hope for the best. If you get the wattage wrong, you’re either paying for electricity you don’t need or you’re still staring at a foggy mirror. Finding the right power balance It really comes down to the size of your mirror and how steamy your bathroom gets. If you’ve got a small mirror—think powder room size, under 500mm x 500mm—a 150W to 250W lamp usually does the trick. But for those big master bath vanities? You’ll need way more power, or maybe a few lamps working together. Just be careful not to overdo it. If you cram too much heat into a tiny space, you risk cracking the glass or ruining the silver backing. You want a steady, even warmth, not a hotspot. The gear inside Most of these setups use quartz halogen tubes. I like these because they heat up instantly. You don’t want to wait ten minutes for the mirror to clear; you want it ready the second the water hits the floor. One thing to keep in mind: higher wattage means more heat. Not just for the glass, but for everything around it. If you’re pushing 500W or more, make sure your housing can handle the temperature so you don’t melt any plastic parts or scorch your wall. And for heaven’s sake, check your wiring. You don’t want your junction box overheating because the current draw is too high. Making it efficient Let’s be real: running a 300W lamp 24/7 is just throwing money away. The smartest way to do this is to wire the lamps to a timer or link them directly to your exhaust fan. That way, the heat kicks in when the steam starts and shuts off when you’re done. One last tip: watch the gap. If the lamp is too far from the glass, the heat just disappears into the wall. To get the most bang for your buck, mount the IR source as close to the back of the mirror as the safety rules allow. Keep it tight, and it’ll work perfectly.