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| Thread ID: 120825 | 2011-09-28 03:06:00 | LED lighting - dimming, colour temperature etc | wratterus (105) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1234186 | 2011-09-28 03:06:00 | Hi guys and girls. Replacing a bunch of halogen downlights and potentially PAR56 spots etc with LED solutions, for lower power consumption and lower heat output. Managing to track down warm white LEDs (under 3500k) is a minor drama in itself, but that's not the main problem I'm having. It's dimming them. They just don't behave in the same way a standard bulb does. I know there are perfectly sound reasons why LEDs don't dim the same way an incandescent bulb does, but if anyone has had any experience with trying to dim LEDs I'd be keen to hear from you! Thanks. :) |
wratterus (105) | ||
| 1234187 | 2011-09-28 21:09:00 | Dimming them by reducing the current to them is not a good option. Ideally, you'd need a device that pulses them on and off very quickly, with the proportions of the on and off phases effectively controlling the degree of dimming. You'll need to watch that the flicker produced stays well above 50Hz where the visual system fails to recognise the flicker. |
Paul.Cov (425) | ||
| 1234188 | 2011-09-29 04:34:00 | You need an LED controller. | pine-o-cleen (2955) | ||
| 1234189 | 2011-09-29 07:16:00 | This is not the same as a FAT controller btw. | R2x1 (4628) | ||
| 1234190 | 2011-09-29 09:53:00 | Dimming them by reducing the current to them is not a good option. Ideally, you'd need a device that pulses them on and off very quickly, with the proportions of the on and off phases effectively controlling the degree of dimming. You'll need to watch that the flicker produced stays well above 50Hz where the visual system fails to recognise the flicker. aka PWM (Pulse width modulation) |
Agent_24 (57) | ||
| 1234191 | 2011-09-29 19:33:00 | Thanks guys. | wratterus (105) | ||
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