General > General Technical Chat
The Dubai Lamp
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amyk:
That is very odd. Why would Philips decide to design and use a more complex driver circuit, which has the same ~0.5PF as the cap dropper/post-regulator in the original Dubai Lamp, instead of simply giving the original one even better LED filaments --- or just selling that one as-is?

BrokenYugo:

--- Quote from: amyk on April 19, 2022, 12:37:52 am ---That is very odd. Why would Philips decide to design and use a more complex driver circuit, which has the same ~0.5PF as the cap dropper/post-regulator in the original Dubai Lamp, instead of simply giving the original one even better LED filaments --- or just selling that one as-is?

--- End quote ---

Perhaps a 120V version is planned? I don't think enough dropper cap would fit in the screw base of a 120V version of the Dubai schematic.
Gyro:
Clive made some interesting comments about colour temperature and tint - 3000k and maybe a slightly greenish tint. Maybe the price (apart from cost) you have to pay for ultimate efficiency.
BrokenYugo:
Yes, the higher CRI phosphors are less efficient, especially at lower color temp, I also think the bulb makers are that much more stingy with the more costly high CRI LEDs and drive them that much harder. I was recently given a new production high CRI 2700k GE bulb that is rated 10 watts for a whole 800 lumens, and the case isn't even quite the full A19 diameter, they put off good light, but for how long?

mikerj:

--- Quote from: amyk on April 19, 2022, 12:37:52 am ---That is very odd. Why would Philips decide to design and use a more complex driver circuit, which has the same ~0.5PF as the cap dropper/post-regulator in the original Dubai Lamp, instead of simply giving the original one even better LED filaments --- or just selling that one as-is?

--- End quote ---

The buck regulator will give flicker free lighting, the same cannot be said for the simple capacitor dropper designs.
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