radium smaydium whats the difference?

[seaduck]

Can someone tell me what is the difference between radium bulbs a reg hqi bulbs???

 

[Entropy]

Radium is a brand name and is a 20k bulb that comes in many wattages and both SE and DE styles. HQI (Hydrargyrum quartz iodide) is a type of metal halide bulb.

 

[seaduck]

Thanks a lot Entropy