Swapping out a burnt-out heating element in a glass lehr is easy. Anyone can do it. But trying to get the thermal profile of a 50-meter tunnel just right? That’s a whole different story. I see it all the time. Plants treat electric heating lamps like lightbulbs—just commodity parts. They find a lamp with the same wattage and length, pop it in, and wonder why their glass is still bowing or stressing. Here’s the thing: it’s not just about the temperature. It’s about how that heat actually moves. When we come in to look at your setup, we aren’t just checking to see if the lights turn on. We’re looking at the spectral output. Shortwave IR digs deep into the glass, while medium-wave is your best bet for stabilizing the surface. If you pick the wrong wavelength for your glass thickness, you end up with a temperature gap between the core and the surface. That’s where the internal stress comes from. And that’s why relying on a spec sheet usually fails. Sure, you can order a lamp with the exact voltage and wattage of the old one. But that doesn’t account for a reflector that’s seen better days or heating banks that have shifted over time. Even a tiny tilt in the mounting can move the focal point of the heat. Suddenly, you’ve got “cold spots” on your conveyor. We don’t guess. We come on-site with thermal imaging to map out where the energy is actually landing. Because what’s written on the box and what’s happening on your floor are rarely the same thing. Now, you might be tempted to just push more power into a smaller space to speed things up. More wattage usually means more throughput, right? Maybe. But it also puts a massive strain on your electrical panels and cooling blowers. If we crank up the heat density to shave time off your cycle, your cooling zone has to be able to handle that extra load. If it can’t, you haven’t actually fixed the problem—you’ve just moved the bottleneck from the heating zone to the cooling zone. We look at the whole line. That way, your power upgrade doesn’t end with a blown fuse or a pile of cracked product.