An Engineer in Wonderland – Alice’s LED ceiling is complete (ish)
I am rather proud of this as there cannot be many fully-LED lit rooms in the world yet.
After a year of contemplation, months of designing, weeks of ordering, days of freezing in the workshop, and hours of wiring in the loft….
….. Alice’s led ceiling project is working.
And it is great.
Nine Cree XP-G leds mounted on laser-cut aluminium metal work have replaced a single 22W CCFL and, at last, I can see in my sock draw.
At the moment, the whole thing is powered from a lab PSU providing 20mA to 1A.
Being able to dim lights over this 50:1 range is a revelation.
20mA gives plenty of light to navigate the room by, and I suspect under 5mA would still be enough.
Comfortable reading requires over 500mA.
11 leds will be needed to complete a nice even pattern in the long oddly-shaped room, so two more will soon be on order – you can just see the extra two sets of metalwork already installed in the middle of the ceiling.
Both photos are taken on the same colur compensation (‘sunlight’), although the camera auto-brighness has removed any possibility of comparing intensity.
What do you reckon?
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