{"id":546,"date":"2026-10-15T15:58:44","date_gmt":"2026-10-15T07:58:44","guid":{"rendered":"http:\/\/www.danishhospitalconstruction.com\/blog\/?p=546"},"modified":"2026-10-15T15:58:44","modified_gmt":"2026-10-15T07:58:44","slug":"how-to-reduce-the-heat-generated-by-cob-led-strip-477c-4cb800","status":"publish","type":"post","link":"http:\/\/www.danishhospitalconstruction.com\/blog\/2026\/10\/15\/how-to-reduce-the-heat-generated-by-cob-led-strip-477c-4cb800\/","title":{"rendered":"How to reduce the heat generated by COB LED Strip?"},"content":{"rendered":"

Hey there, if you\u2019re reading this, chances are you\u2019ve been messing with COB LED strips lately and hit a wall with heat\u2014maybe your strip\u2019s running hot enough to make you nervous, or it\u2019s cutting down on its lifespan way faster than you expected. As a COB LED strip supplier, I\u2019ve had way too many conversations with folks (from small electricians to big retail fit-out teams) asking the same question: how the heck do we tame all that extra heat? First off, let\u2019s get one thing straight\u2014heat isn\u2019t the enemy here, but too much? That\u2019s when COB strips start to die early, dim out, or even mess with the color consistency you\u2019re paying for. I\u2019ve seen it firsthand: a client ordered 500m of our premium high-CRI COB strips and installed them in a ceiling cavity without any airflow, and half the run died in 8 months because of heat buildup. So today, I\u2019m spilling all the real, actionable tips we\u2019ve tested over years of supplying these things\u2014no jargon, no fluff, just what actually works. COB LED Strip<\/a><\/p>\n

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First, let\u2019s do a quick reset on what makes COB LEDs different from those old SMD strips you might have used before. COB (Chip On Board) means all the LED chips are mounted directly on the same circuit board, not spaced out with gaps between them. That makes them way brighter and more uniform in light, but the flip side is\u2014there\u2019s no empty space between chips to dissipate heat. All that light comes from a tight cluster of chips, so if you don\u2019t get that heat out fast, it just pools on the board. Most people don\u2019t realize that COB strips run hotter at the same lumen output as SMD, so you can\u2019t treat them like the same thing. Let\u2019s start with the biggest fix, because 90% of heat issues come down to this: the backing you mount the strip to.<\/p>\n

I know, I know\u2014you can tape a COB strip to any flat surface, right? Wrong. We\u2019ve tested this so many times with our own strips. The sticky 3M adhesive we put on the back is strong, but it\u2019s for temporary mounting, not heat transfer. If you just stick it to drywall, plywood, or even plastic trim, that adhesive is a terrible heat conductor\u2014all the heat from the COB chips stays on the strip, building up. The fix here is upgrading the mounting surface to something that moves heat away. The best option, hands down, is aluminum channel. Not just any aluminum channel\u2014look for one with a flat, wide heat sink base, not a skinny, decorative one that\u2019s just for looks. We supply our strips with pre-cut aluminum channels for exactly this reason, and every client that uses them reports a 20-30% drop in operating temperature within the first week of installation. Wait, but not all aluminum is the same\u2014go for extruded aluminum, not stamped. Stamped is thinner, has more uneven edges, and doesn\u2019t conduct heat as well. Also, make sure the channel is the right width for your COB strip. If the strip\u2019s too narrow, it might not sit flat against the channel\u2019s base, leaving air gaps that block heat transfer. If it\u2019s too wide, the channel isn\u2019t doing its job. We usually tell clients to measure their COB strip\u2019s width (most are 8mm or 10mm for our popular models) and pick a channel that\u2019s 0.5-1mm wider on each side to fit snuggly. Another quick tip: when you mount the strip in the channel, peel back the adhesive about 10cm at a time and press firmly along the entire length, not just the ends. Air bubbles under the strip act like insulation, so getting a perfect, gap-free bond is key.<\/p>\n

Next up, power supply sizing and wiring\u2014this is the second most common mistake we see. People grab the cheapest power supply they can find that matches the voltage (most COB strips are 12V or 24V, right?) and call it a day. But if you\u2019re running a long strip (like more than 5m of 24V, or 3m of 12V) that\u2019s underpowered, you have to crank up the current to get enough light. More current = way more heat. Let\u2019s do the math quick: a 5m 24V COB strip is usually 24W total, so that\u2019s 1A of current. If you hook it up to a 1A power supply, wait\u2014no, actually, you need to leave headroom. A power supply that\u2019s 10-20% over the total wattage of your strip is non-negotiable. If you have a 5m 24W strip, don\u2019t use a 25W supply\u2014use a 30W one. Why? Because power supplies run most efficiently at 70-80% of their maximum load. Run them at 100%, and they get hot too, which adds to your COB strip\u2019s heat. Also, wiring size matters. If you\u2019re running a long strip, don\u2019t use thin 22AWG wire\u2014use 18AWG or even 16AWG for runs over 10m. Thin wire causes voltage drop, which again means you need more current to get the same brightness, leading to more heat. We had a client last year who installed a 20m run of our strips with 22AWG wire and a 50W power supply\u2014after a month, the strip was running so hot the adhesive started melting. Swapping to 18AWG wire and a 60W supply fixed it immediately. Pro tip: if you\u2019re splitting a long run into multiple shorter runs (say, two 10m runs instead of one 20m), use parallel wiring, not series. Series wiring means the current has to go through one strip first, building up heat before it gets to the second. Parallel splits the current evenly, so every segment runs cooler.<\/p>\n

Now, something most people sleep on: dimming and color temperature tuning. Wait, how does dimming relate to heat? COB LEDs are super efficient at full brightness, but if you dim them below 50% with a cheap dimmer, you\u2019re actually making them run hotter. No, that\u2019s not a conspiracy\u2014let\u2019s explain. Cheap dimmers work by cutting parts of the AC wave to lower the voltage, which causes electrical waste. That waste turns into heat, which is dumped back into the LED strip. If you use a high-quality, dimmable power supply that\u2019s matched to your COB strips (we recommend dimmable Mean Well or our own branded dimmable supplies for our strips), you get a \u201ctrue\u201d dimming that adjusts the current without extra waste heat. Also, color temperature matters. 3000K warm white COB strips usually run cooler than 6000K cool white or RGB strips. Wait, why? Because the phosphors used for warm white take less energy to produce that yellow light, so less energy is lost as heat. If you\u2019re set on cool white, just know that you might need a slightly bigger heat sink or more airflow to keep temps down. We actually have a client who uses our 5000K COB strips for outdoor billboards\u2014they run them with oversized aluminum channels and a small fan, and they\u2019ve been going strong for 2 years with zero heat-related issues.<\/p>\n

Airflow and ventilation\u2014this is the big one for enclosed spaces, which is where most heat problems happen. If you\u2019re installing COB strips in a closed ceiling cavity, behind a TV wall, or inside a cabinet, you can\u2019t just mount them and forget about airflow. Trapped hot air is like a blanket for your strip, keeping all that heat from escaping. The fix here is simple: add small vents, or leave a 1-2cm gap between the strip and any closed surface. For example, if you\u2019re mounting strips under kitchen cabinets, don\u2019t push them all the way back against the back wall of the cabinet. Leave a tiny gap, so air can circulate behind the strip. If you\u2019re installing in a ceiling, cut small 5cm vents at each end of the channel, or use a channel with built-in ventilation holes (we actually stock vented aluminum channels for this exact use case). For really tight, enclosed spaces, a tiny 5V USB fan (we have clip-on fans that work perfectly for small cabinet installs) can move enough air to drop strip temps by 15 degrees Celsius or more. I\u2019ve tested this myself in a closed cabinet setup\u2014no fan, strip ran at 52\u00b0C; with a $5 fan, it ran at 37\u00b0C. That\u2019s a huge difference for lifespan.<\/p>\n

Another trick we\u2019ve picked up from years of supplying COB strips: derating. Wait, derating just means running the strip at less than its maximum rated output. Most COB strips have a maximum current rating (for example, our standard 8mm COB strips are rated for 8W per meter, but they can handle up to 10W per meter if you push them). Pushing them to the max is tempting for extra brightness, but every watt over the rated output adds more heat. If you derate by 10-15%\u2014so run a 8W\/m strip at 7W\/m\u2014you won\u2019t even notice a drop in brightness, but the strip will run 10-12\u00b0C cooler. That\u2019s a massive win for lifespan. We have a lot of clients who specify derated strips for commercial projects, like retail display cases, where the strip is on 12 hours a day, 7 days a week. They pay a tiny bit extra for the derated current, but save thousands on replacement costs down the line.<\/p>\n

Wait, let\u2019s talk about common mistakes I see all the time that people don\u2019t realize add up. First, not trimming the strip correctly. COB strips have cut points every few centimeters (usually every 5cm for our 8mm strips). If you cut between the copper pads, you leave those sharp, unprotected edges exposed, which can cause a short circuit. A short circuit makes the strip draw way more current than it\u2019s supposed to, leading to sudden heat spikes that can burn out a whole section. Always cut at the designated marks, and use a strip connector or solder the wires properly to the copper pads\u2014no loose connections, because loose wires cause resistance, which turns into heat. Second, not accounting for ambient temperature. If you\u2019re installing COB strips in a hot environment\u2014like outdoors in direct sun, or a kitchen where the oven is running all day\u2014your strip\u2019s operating temp is already higher. So you need to adjust accordingly. For outdoor installs, use strips rated for outdoor use (our IP65 waterproof COB strips are sealed, but still need good mounting to aluminum to dissipate heat) and make sure they\u2019re not in direct sun. In a hot kitchen, add a small fan or use a wider heat sink channel.<\/p>\n

Let\u2019s also bust a myth I hear all the time: \u201cCOB strips run so hot that I need to add a heatsink every time, no exceptions.\u201d No, that\u2019s not true. If you\u2019re installing a short run (less than 2m) in an open area, like a bookshelf, you don\u2019t need an aluminum channel. The air around the strip is enough to keep temps safe. But for any run over 2m, or any install in a closed space, the heat sink is non-negotiable. I\u2019ve seen clients get away with short runs without heat sinks, but once you go longer, that\u2019s where the problems start.<\/p>\n

Now, let\u2019s wrap this up with a quick checklist you can use next time you\u2019re installing COB LED strips, no matter if you\u2019re a DIYer or a big contractor: 1. Pick the right mounting: use extruded aluminum channel (correct width, not decorative stamped stuff). 2. Size your power supply properly: 10-20% headroom over total wattage, match voltage to your strip. 3. Use the right wires: 18AWG for runs over 10m, 20AWG for runs under 5m. 4. Ditch cheap dimmers: use high-quality, matched dimmable power supplies to avoid waste heat. 5. Add airflow: leave gaps, use vented channels, or tiny fans for enclosed spaces. 6. Derate: run the strip at 80-90% of its maximum rated wattage for longer life. 7. Trim and connect correctly: only cut at designated marks, secure connections to avoid shorts.<\/p>\n

At the end of the day, heat is just part of working with high-powered LED strips, especially COB ones that are designed to be super bright. The good news is that almost all heat-related issues are fixable with small, cheap changes\u2014no need to overhaul your whole lighting setup. I\u2019ve worked with all kinds of clients, and the ones that follow these tips have way longer-lasting COB strips, less callbacks, and better light quality than the ones that skip these steps.<\/p>\n

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If you\u2019re working on a project and need help picking the right COB strip, heat sink, or power supply, we\u2019re here to help. Whether it\u2019s a small residential install or a big commercial project, we can hook you up with the right products and answer any questions you have about heat management. Just reach out to our team to chat through your needs. No pressure, no sales pitch\u2014we know how frustrating it is when LED lighting doesn\u2019t work as promised, so we\u2019re happy to help you get it right.<\/p>\n

CCT Tunable White<\/a> References<\/p>\n

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  1. International Electrotechnical Commission. (2018). IEC 62031: Light-emitting diode (LED) modules for general lighting \u2013 Safety specifications.<\/li>\n
  2. LED Technical Association. (2021). COB LED Thermal Management Best Practices. LTA White Paper Series.<\/li>\n
  3. Extruded Aluminum Heat Sink Council. (2020). Guidelines for Heat Sink Selection for LED Lighting Applications.<\/li>\n
  4. Energy Star. (2019). LED Lighting Product Performance Requirements: Thermal Management and Longevity.<\/li>\n<\/ol>\n
    \n

    Shenzhen Tingliang Optoelectronics Co., Ltd.<\/a>
    With over 15 years’ experience, we are one of the most professional cob led strip manufacturers in China. Please feel free to buy discount cob led strip for sale here and get quotation from our factory. We also accept customized orders.
    Address: 2nd Floor, Building 1-6, Tongfuyu Industrial Zone, Shiyan, Bao’an District, Shenzhen
    E-mail: tl@tl-led.cn
    WebSite:     https:\/\/www.tlledstrip.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, if you\u2019re reading this, chances are you\u2019ve been messing with COB LED strips lately … How to reduce the heat generated by COB LED Strip?<\/span>Read more<\/a><\/p>\n","protected":false},"author":40,"featured_media":546,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[509],"class_list":["post-546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-cob-led-strip-4975-4cf169"],"_links":{"self":[{"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/posts\/546","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/users\/40"}],"replies":[{"embeddable":true,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/comments?post=546"}],"version-history":[{"count":0,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/posts\/546\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/posts\/546"}],"wp:attachment":[{"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/media?parent=546"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/categories?post=546"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.danishhospitalconstruction.com\/blog\/wp-json\/wp\/v2\/tags?post=546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}