I originally buy the lead model of this flashlight thinking I can mod that use a terralux lead mod , but that model have the wrong type of bulb socket . the regular non-led be the one of buy for the TerraLux mod . and it be very bright as soon as I pull out the regular bulb and install the terralux ministar2 tle-5ex mod . the only portable flashlight I need to carry around with I now .