angeli said:I can't imagine using a grow light system inside a small van space, unless it were very very tiny. Unless the technology has changed considerably, the heat generated by specialized grow lights and the transformers is considerable, and then there is the electricity to consider. ..........
Actually the technology for providing light for indoor growing has already changed, it changed about 10 years ago and ever since then the lights have kept getting more efficient. Grow systems are now using LED lights. Almost all commercial growers have switched to LED take advantage of the considerable savings for powering their operations.
You can purchase 12v LED grow lights as tubes, panels and even traditional light bulb shapes holding the LED arrays. They are available from online sources and in some brick and mortar stores as well. They are not overly expensive to buy and there are quite a few websites selling them including Ebay and Amazon.
Just use the keywords "12v LED grow light" to find them. You will of course have to do a little extra research to find out what the exact power useage is going to be and how many lumens the unit produces, etc.
Let there be light