Osram HCI-TC Powerball gas discharge lamps are extremely efficient bright light sources. With the usage of 400w, these light sources can emit up to 40,000 lumen! But we have several wattages available, so you can pick the amount you desire. The Color Rendering Index of these Osram gas discharge lamps can be very high, which means that colors will be shown very natural. Check the specifications per product to see the CRI. Osram HCI-TC light sources are mostly used in sports stadiums. Always check the base of your lamp before ordering a new one. Osram HCI-TC Powerball lamps have a G8.5 base.