ICICI Securities maintains 'Buy' rating for Crompton Greaves Q4 results with 28% upside potential.Crompton reported revenue/Ebitda/PAT growth of 5.1%/29.9%/22.3% YoY.Gross margin increased by 201bps YoY, driven by the profitability revival of Butterfly and higher margins in the Lighting segment.Ebitda margin improved by 245bps YoY, and repayment of debt led to lower interest costs. Effective tax rate increased by 452bps YoY.