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SAD sunrise clock, led bulb mod? Answered

I suffer with SAD and a sunrise clock helps a lot getting up in the mornings and winding down at night.
I have one similar to this
It uses ses 14 bulbs, currently using halogen 42W but these don't last long and I managed to blow one closing a drawer!
So, I'm looking for a way to use 10 to 20W leds  but obviously, given its UK mains voltage that does the timed dimming, finding a suitable LED driver is difficult. There are a few out there but I've no idea which ones will work as it need it to. Also, the only commercially available dimmable led bulbs are e27 fit only, very expensive and only 12W, around 400 lumens. I need at least 600. Also the more the better. Looking to use 6400K or higher colour, as the higher temp colours are proven to be better for SAD.
I can make electronic circuits and have hacked together/repaired plenty of stuff. I would rather build something than buy as I don't have £££ to spend!
Does anybody have any ideas to help me get started?
I'm also looking to replace my SAD bulbs, currently 85W cfls with LEDS as well.

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steveastrouk

7 years ago

LEDs aren't at a price where replacing CFLs makes sense yet. Affordable State of the art for LEDs is currently around 100 lm/Watt - at around 6 USD each for the naked LED. 85 W CFL's are also typically around 100lm/Watt, and you can buy a LOT of light - 8500lm for what ? 10 USD ?

Steve

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steveastrouk

7 years ago

Moral: Don't use mains voltages - use a transfomer. Try Farnell for a source of the latest 1200 Lm LEDs - a box with a few of them in it will give you the 10,000 Lux at 10" you need minimum for effective light therapy - that IS quite bright.

The new LEDs are great, but you WILL need to heatsink them.

Steve

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kristyonsteveastrouk

Reply 7 years ago

I want to use my existing sunrise clock, which uses a standard ses bulb. Building a standalone SAD lamp would be easy (i use high power photo cfl bulbs at home instead), but the dawn/dusk simulation is the hard bit. This is why I am wanting to use the clock I already have. All other designs I've found use microcontrollers and that is well outside my expertise and budget.
I know mains dimming of LED of lamps is possible because phillips sell one a dimmable 12w led bulb but they are as much money as the clock itself and too big to fit.

I have found some dimmable led controllers which could I could adapt my clock with (these are expensive too!), but I was really hoping someone could shed a light (bad pun!) on the kind of circuitry I need to convert mains dimmer output to something that will dim the LEDs. I may yet find that my clock has some kind of dc output perhaps before it reaches a Triac but I have not dismantled it yet to find out.