It gives you a hint that it might be good for you if you take that direction. You may find your soul mate around the block.
usually due to a defective daytime running light module failure..
This isn't an easy answer, because it depends on the type of grow light (fluorescent, HID, LED), the size of the garden, and also changes over time. I've suggested a link that discusses costs...
Check your fuses. See owner's manual fo rlocation and identification of fuses.
How many running lights does a 2001 Nissan Maxima have ?