The main difference between the "Philips Hue Bloom Basis BT" and the slightly more expensive standard "Philips Hue Bloom" lies in the following aspects:

## Functionality and compatibility
- The "Bloom Basis BT" is primarily designed for Bluetooth connectivity and can be operated without a bridge, albeit with limited functions. The standard "Philips Hue Bloom" can also be controlled via Bluetooth, but it offers additional functions when connected to a Hue Bridge, such as remote control, automations and a stable connection.

## Light output and colours
- Both models offer a light output of up to 500 lumens and a colour temperature of 2000-6500 Kelvin. However, there are no specific differences in light output or colour quality between the two models.

## Prices and additional functions
- The more expensive version might offer additional functions or better integration with other smart devices, especially when connected to a bridge. However, the basic version is less expensive and still offers a comprehensive smart lighting function via Bluetooth.

## Design and material
- There are no significant differences in design or materials between the two models. Both are made of metal and plastic and have a similar size and shape.

If you already have a bridge at home, investing in the more expensive standard version might make sense to utilise the full smart lighting features. However, if you only need a simple Bluetooth-based control, the "Bloom Basis BT" could be sufficient.