Why LED took over most of the truck, and what still separates a good panel from a cheap one
Introduction
LED lighting has taken over a huge share of the work tungsten and HMI used to handle, mostly because it solves three problems at once: it runs cool, it draws far less power for a given output, and unlike a fixed tungsten or HMI source, most LED fixtures can shift their color temperature electronically rather than needing gel or a bulb swap. That combination has made LED panels the default choice on a large share of productions, from small run-and-gun crews to major studio stages.
Bi-Color and RGB Panels
A bi-color panel mixes warm (around 3200K) and cool (around 5600K) LEDs, letting an operator dial in any color temperature between the two electronically instead of gelling the fixture. RGB and RGBW panels go further, mixing red, green, blue, and sometimes white LEDs to produce nearly any color and temperature, including deeply saturated colors that would otherwise need heavy gel. That flexibility is a big part of why LED panels have become a fast, gel-free way to match or creatively shift a lighting setup mid-shoot.
CRI and TLCI: Why Not All LEDs Are Equal
Output and color-temperature flexibility don’t guarantee accurate color rendering. Cheaper LED panels can produce light with poor color rendering, gaps or spikes in the spectrum that make skin tones look slightly off or cause certain colors to render inaccurately on camera, even if the panel reads as the correct color temperature on a meter. Color rendering index (CRI) and television lighting consistency index (TLCI) are the two most common ways this gets measured and compared between fixtures, and it’s worth checking those figures rather than assuming all LED panels with the same wattage and color temperature will look the same on camera.
Power and Portability
Because LED fixtures draw so much less current than an equivalent tungsten or HMI source, many panels can run entirely on battery power, with no ballast and minimal cabling, which is a major reason they’ve become the default for documentary, run-and-gun, and location work where a full tungsten or HMI power package isn’t practical. Larger LED fixtures built to replace bigger HMI units still need mains power, but even those typically run cooler and simpler than the fixtures they’re replacing.
Where LED Still Falls Short
For raw output per fixture, a large HMI still outpaces most LED panels of a comparable size, which is why HMIs haven’t disappeared entirely from big exterior and daylight-overpowering work. And at the budget end of the LED market, color rendering can genuinely be worse than a basic tungsten fixture, which is why checking CRI and TLCI figures matters more with LED than it ever did with tungsten.
Conclusion
LED panels won the middle of the market by being cooler, more efficient, and more flexible than tungsten or HMI, with color temperature and often color itself adjustable at the fixture instead of through gel. The one thing to watch is quality: a panel’s wattage and stated color temperature don’t guarantee good color rendering, so it’s worth checking CRI and TLCI numbers rather than assuming every LED panel performs the same on camera.