<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8"><title></title><meta name="GENERATOR" content="OpenOffice.org 2.0 (Linux)"><meta name="AUTHOR" content="Garry"><meta name="CREATED" content="20060614;18320600"><meta name="CHANGED" content="16010101;0"> \t \t \t \t \t \t<style type="text/css"> \t \t</style> I've been looking into buying a 400W HPS light for my 3'x5' grow space (closet) with 5' of vertical space. Heat and limited vertical space makes me wary of HID lights. Now here's my dilemma... I do not have the money nor permission to be drilling holes and installing a good ventilation system. I currently have a fan mounted the the top back corner that runs constantly, indirectly (fan points toward back edge of opposite wall) moving air in the grow space. The door of the closet is left open for extended periods during the lights-on cycle and closed during lights-out. This has been sufficient for my fluoro setup. The closet stays fairly warm during summer time getting as hot as 90 F. Is a HPS light going to create too much heat? Second, my height limitations. Most advice I've seen recommends 2-3 ft between light and plant, which gives me 2-3 ft of possible vertical growth. I plan on trying LST of scrog. LST is my fist choice but I will plan for scrog if it is more practicable for my situation. Will I be wasting my time and money on a HPS light? Is it feasible to get descent yields with my grow space?