Look at the reliability of bull signal bars on the 30 minute chart. Context must be correct to buy close of these bars... I won't buy a bull signal bar if market moves into tight consolidation or at top of range/channel (or bottom of range/channel if in bear market). Look for strong closes (no wick, close at top of bar), and you want close to close above previous bear bar or doji with bull body (bull push up on bear bar leaving prominent wick on bottom of bar).