Philips Master Color 4200k
Superior color quality. Crisp white light. 4200K color temperature, High 92 CRI, 34,300 initial lumens (109 lm/W). High 90% lumen maintenance at 8,000 hr./High 85% PPF maintenance at 20,000 hrs. Unique open rated lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use.
Until the lamp has achieved a least 10 hours of operation, the lamp should never be turned off sooner than 2 minutes, including during the installation test. In case that this has happened, you will have to wait 1 hour before switching on again. Failure to comply with this requirement may lead to ignition problems.