We started flowering our plants almost 3 weeks ago, so far except for a few preflowers we are getting no bud sites happening. We are growing in a 3'' space with a 400 watt hps. We have 10 plants that have vegged nicely but are just refusing to bud. We have grown inside before and have had success. The difference is the light this is the first time using an hps, have always used flurescents before. We are not sure of the strain but we think it is probably a sativa/indica hybrid. What are we doing wrong? This has never happend before. Any ideas would be appreciated. Thanks.