interfering tone - a single case?

interfering tone - a single case?

Philips Corepro LEDbulb 9.5 to 60 W 827 E27 Dimmable 74,741,300 (household goods)
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Customer Review

to compare 2 dimmable LED lamps have been ordered with E27, a Philips and Osram. Both have 10W and are indicated with Warm White.

At that Philips lamp I can say:
+ Significantly cheaper in price
+ The light is properly
+ Quite bright compared to a normal 60W bulb

- A continuous tone (approx 320Hz) even when operating with an undimmed unacceptable volume of biszu 47 dB at 50cm distance (if one is under the ceiling lamp.
- Dimmed yet disturbing

As a returning and re trying for a product under 10 euros, this lamp is not worth banished as Garage interior lighting out of the house. As Keller hallway light it might even gone yet.

Note: Since only one lamp was ordered by this variety there may be an isolated incident.

Lower-priced LED lamps I will continue to buy only the retail site, because I can 'sometimes just' again put on the counter and exchange.

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