We don't currently offer a GU10 fitting. GU10 bulbs are typically designed for spot or accent lighting, meaning they don't provide the broad, even light coverage that plants need for healthy growth. They're also usually installed in ceiling downlights, which positions them too far from your plants to deliver enough light intensity, as light intensity drops significantly with distance.
Our grow lights use E27 and B22 fittings instead, as they allow for better heat management and a wider beam angle, making them much more effective for plant lighting.
Let us know if you have any questions!