![\"24V](\"https:\/\/tecolite.com\/wp-content\/uploads\/2026\/10\/24V-LED-Bulbs-with-DALI-KNX-and-Loxone.webp\")
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A common mistake in 24V DALI projects is choosing a phase-cut dimmer simply because it says "DALI" on the spec sheet. The controller may be DALI-compatible, but its output isn’t suitable for driving a 24V PWM bulb.<\/p>\n
The bulb doesn’t know whether the dimming command came from DALI, KNX or Loxone. If it’s designed for external PWM dimming, what matters is the electrical signal it receives from the controller. Everything upstream\u2014the protocol, the gateway, the actuator\u2014just converts a user command into that PWM signal.<\/p>\n
"DALI compatible" usually means the bulb works with a DALI system through an external controller\u2014not that the bulb has DALI electronics inside. If the project specification requires DALI-certified devices on the bus, a 24V PWM bulb is not that.<\/p>\n
For a 24V bulb, the DALI device you need is normally a DALI constant-voltage PWM driver. It receives the DALI command and sends PWM to the bulb. You need three things to line up: a DALI driver with a 24V DC, constant-voltage PWM output; a bulb explicitly rated for PWM input; and a channel load that stays within the driver’s minimum and maximum limits.<\/p>\n
The mistake to avoid is buying a "DALI dimmer" because the name sounds right. A DALI phase-cut dimmer controls mains-voltage loads. It is not the right device for a 24V DC bulb.<\/p>\n
![\"Comparison](\"https:\/\/tecolite.com\/wp-content\/uploads\/2026\/10\/DALI-Phase-Cut-vs-24V-PWM-Dimming.webp\")
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If you are replacing halogen or mains-voltage GU10s with 24V GU10s, the DALI architecture usually changes too. You are no longer switching mains voltage to the fitting; you are feeding the fitting from a 24V supply and controlling it with a DALI PWM driver.<\/p>\n
If your project requires DALI-2 certified gear, check the device that actually sits on the DALI bus. A PWM bulb downstream of a DALI controller is not automatically DALI-certified.<\/p>\n
If you’re unsure whether a particular DALI driver will play nice with a particular bulb, test one of each before committing to a project. DALI drivers from different manufacturers can behave differently even when the specs look identical.<\/p>\n
KNX projects usually go one of two ways: either a KNX PWM actuator drives the bulbs directly, or KNX talks to a DALI gateway which then drives DALI controllers. Both work. The bulb doesn’t know the difference.<\/p>\n
What matters is the device that actually outputs power to the bulb. If it sends 24V PWM and the bulb is rated for that PWM input, the KNX layer is not the problem.<\/p>\n
![\"Comparison](\"https:\/\/tecolite.com\/wp-content\/uploads\/2026\/10\/Loxone-Dimmer-Extension-vs-RGBW-24V-Dimmer-Tree.webp\")
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With Loxone, the exact module makes a big difference. Two common Loxone lighting products look similar on paper but do completely different jobs.<\/p>\n
The Loxone Dimmer Extension is designed for mains-voltage phase-cut dimming. It does not provide the 24V PWM output that an external-PWM dimmable bulb needs.<\/p>\n
The Loxone RGBW 24V Dimmer Tree is different. It has four PWM outputs rated at 2.1A per channel, with a PWM frequency of around 123Hz. That makes it a possible match for 24V PWM bulbs\u2014provided the bulb’s driver accepts that frequency and the channel load is within limits.<\/p>\n
The useful question is not "does this bulb work with Loxone?" It is: which Loxone module is installed, and how many bulbs are on each output?<\/p>\n
Send us the Loxone module number and the number of bulbs per channel. We’ll check the electrical specs and let you know whether a sample test is worth running before you order.<\/p>\n
![\"24V](\"https:\/\/tecolite.com\/wp-content\/uploads\/2026\/10\/DALI-PWM-Dimming-for-24V-LED-Bulbs.webp\")
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Before ordering, check the controller’s minimum load per channel. Some PWM controllers and dimming actuators need a minimum load to regulate properly. One or two low-wattage bulbs may not be enough, which causes poor low-level dimming, flicker or unstable behaviour.<\/p>\n
Do the math. Six 5W bulbs on one 24V channel is 30W total\u2014roughly 1.25A at nominal 24V. A controller rated for 2.1A per channel may have enough continuous capacity, but you still need to check the manufacturer’s minimum and maximum load ratings and any startup current requirements. The number of bulbs alone doesn’t tell you whether a channel can handle them.<\/p>\n
If a channel is underloaded, you either need more bulbs on that circuit or a controller designed for low minimum loads.<\/p>\n
At 24V, the last bulb on a long cable run can see noticeably less voltage than the first one. If the end of the run dims differently, buzzes or won’t go as low, measure the voltage at the last bulb before you blame the bulbs.<\/p>\n
If the voltage at the last bulb drops below the bulb’s rated input range, check the cable size and circuit length. A thicker cable or a shorter run usually helps. Don’t just turn up the supply voltage to compensate\u2014check the bulb’s allowed input range first.<\/p>\n
Long, thin cable runs will bite you at 24V. The current is higher than it would be at mains voltage for the same wattage, so undersized conductors cause problems fast.<\/p>\n
Even when the voltage, current and PWM specs all line up, test the bulb with the actual controller before ordering the full batch. Datasheets don’t tell you how smoothly the bulb dims at 5% or whether it flickers on camera. A half-hour sample test saves a lot of on-site fixes.<\/p>\n
Pay attention to low-brightness stability, fade smoothness, and whether several bulbs behave the same way.<\/p>\n
If you are planning a DALI, KNX or Loxone project with 24V bulbs, send Tecolite your controller or actuator model, power-supply details, number of bulbs per channel and required dimming range. We can help review the system requirements before you order samples.<\/p>","protected":false},"excerpt":{"rendered":"
How to Use 24V LED Bulbs with DALI, KNX and Loxone A common mistake in 24V DALI projects is choosing a phase-cut dimmer simply because it says "DALI" on the spec sheet. The controller may be DALI-compatible, but its output isn’t suitable for driving a 24V PWM bulb. The bulb doesn’t know whether the dimming […]<\/p>\n","protected":false},"author":3,"featured_media":85873,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-84961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/posts\/84961","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/comments?post=84961"}],"version-history":[{"count":1,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/posts\/84961\/revisions"}],"predecessor-version":[{"id":88955,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/posts\/84961\/revisions\/88955"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/media\/85873"}],"wp:attachment":[{"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/media?parent=84961"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/categories?post=84961"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tecolite.com\/ru\/wp-json\/wp\/v2\/tags?post=84961"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}