5U-105W节能灯温升高,求助!!!

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大家帮帮忙,在调一款5U灯,三极管温升有23-25度,没办法再降下去.这是一体化节能灯来的,中间有隔板,上面温升是板放在外面测的,从170V到265V测到的最高温升有25度,上面的线路及测试参数,大家帮忙给点意见.
三极管仙童J13009-2的.
灯管:Ψ17/5U200mm