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| 48V lamp |
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| BillTodd:
--- Quote ---Bill does your project mean that you've tried connecting straight to the 50V supply? --- End quote --- Yes, the led bulb psu will run at 50vac ( about 70vdc when rectified internally) but it will not give full brightness and will likely over heat - The power o/p is almost constant ,so as input voltage drops current goes up and the losses will increase. They seem to be ok down to about 65-70vac (the smpsu chips are typically rated from 90-250vac ) The doubler circuit gives the bulb about 128vdc (if memory serves) sufficient for the psu to run at constant power. |
| BillTodd:
Just a thought... I have not tried the dim-able LED devices . These could potentially work down to a lower voltage but whether they will sense the lower input and will dim ,or only sense the phase start/ stop angle and remain full o/p , I don't know |
| Swarfing:
By the time you have bought all the bits to convert this, you might as well bite the bullet and just pay the £4.00 each for some GLS lamps surely? |
| Swarfing:
https://www.easy-lightbulbs.com/light-bulbs/general-household-lighting/gls-bulb/bayonet-22mm-diameter/gl5060bc-ca/?gclid=Cj0KEQiA4LCyBRCY0N7Oy-mSgNIBEiQAyg39thgQXTLCCxuRVE3NnZ2_rH446Vk3MKNatpSNl9IWfWsaAiI08P8HAQ It's a shame really as i gave a load away last year with a load of festoon lights that used these bulbs |
| BillTodd:
--- Quote from: Swarfing on November 18, 2015, 11:21:46 AM ---By the time you have bought all the bits to convert this, you might as well bite the bullet and just pay the £4.00 each for some GLS lamps surely? --- End quote --- 50v gls lamps are awful , they have a horrible yellow glow that barely lights the work and seem to darken the room when on. I have working bulbs, just much prefer leds. I had previously had three 12v lamps in series with a small dropper resistance (12v lamps are fine up to about 20v) |
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