The Ultra Vitalux from Osram is a classic light bulb for you terrarium especially in the beginning of your reptile´s life when many UV rays are needed. The Radium Sanolux is similar to Osram rays. Both have E 27 light sockets made from porcelain & don´t need regulation equipment such as an HQL. Compared to fluorescent bulbs the UV concentration from this product´s UV rays is higher & has a longer range than fluorescent bulbs. The qualities offer your reptile an optimal environment that will increase the activity & appetite of your pet. Caution Because these rays are exceptionally strong your animals should only receive 30 minutes daily The 300 W Osram Vitalux & Radium Sanolux are high quality bulbs made with porcelain. What´s this?