Hello,
Thank you for your message, the colour of our product can vary depending on their environment and ambient light, we have created a blog article in collaboration with Antoni Malinowski about this that you can find on our website ( in English ) https://mathmos.eu/the-appearance-of-colour/
For this particular lamp, it would be recommended to use on a bright room rather than in the dark as the tealight emit less light than a bulb powered lamp.
If you feel that your product is still not correct, please contact the customer service directly.
Kind regards
Mathmos Team