Make sure you keep the grow light away from water! It is not a waterproof unit and is susceptible to damage caused by water! rn2. While it does not come with a built-in timer which you can use, but it supports external timers. You can buy one off amazon and pair it up with your Viparspectra 600W light to get the most out of it.rn3. Do not use the light for more than 16 hours a day. This ensures that your lights are not overworked and the plants also get some cooling period which is required for their proper growth.rn4. Use the bloom and veg mode carefully. Don’t keep it in bloom mode when your marijuana is still in the vegetative state.