If someone wants to use this in a companion mod, or otherwise tweak it further by adding it to the world via quest, or a vendor, feel free. 
Just make sure to give me credit. :)

Lambda HEV Mark 4 Suit Stats:
+1 AGI
+20 AP
+10 Poison Resistance
+10 Fire Resistance
+25 Radiation Resistance
- No Power Armor Training Required
- Weighs 25 instead of 40
- Medium Armor
- Can be additionally repaired with:
Metal Armor, Reinforced Metal Armor, Scrap Metal
player.additem XX000ADD 1 

Lambda HEV Helmet Stats:
-1 PER
+20 AP
+5 Poison Resistance
+5 Fire Resistance
+10 Radiation Resistance
- Water Breathing
- 100 HP
- 3 Weight
- 5 DT
-Medium Armor
- Can be additionally repaired with:
Recon Helmet, Metal Helmet ( & Reinforced), Combat Helmet (Reinforced, MI & II), Scrap Metal
player.additem XX000ADE 1 

Lambda HEV Rebreather Stats:
+1% Increased Critical Chance
+20 AP
+5 Poison Resistance
+5 Fire Resistance
+10 Radiation Resistance
- Water Breathing
- 100 HP
- 1 Weight
- 3 AR
- 1 DT
- Light Armor
- Can be repaired with:
Recon Helmet, Metal Helmet ( & Reinforced), Scrap Metal
player.additem XX000ADD 1 

Credit to:
Lambda HEV Power Armor - By Zealotlee
For the Lambda Symbol Texture

Bonus:
Lambda Motorcycle


-------------

Version Change Log

V0.1
- Initial Release

V0.2
- Fixed back (butt) plate added detail instead of entirely matte black.
- Fixed inner leg proper metal color, added mesh lining
- Added orange stripes on back to reduce over-abundance of black.

V0.2B (Optional)
- Same changes as above
- Made front plate 'longer' to merge with the existing flexible material, with added orange lining detail.

V0.3 & V0.3B
- Color correction, more orange, less yellow-orange
- Update 3??? Half-Life 3 confirmed. ;)

V1.0
- Look down. Now look back up. THE MOD IS NOW STAND-ALONE!
- No DLC Required
- Added unique meshes/texture paths.
- Added unique Pip-Boy Icon
- .ESP made to put unique item in game
- Item can only be added with the console: player.additem XX000ADD 1
(Where XX equals the load order of the mod)

V1.0B (Optional)
- Added a helmet, separate .ESP, optional download
- Added unique Pip-Boy Icon
- Item can only be added with the console: player.additem XX000ADE 1 
(Where XX equals the load order of the mod)

V1.0C (Optional)
- Pip-Boy 3000 and Glove re-texture (Initial Release, quick and dirty)
V1.1C (Optional)
- Pip-Boy HEV Mark IV
- 2048x2048 Texture Resolution
- More details added
- Matches armor better

V1.0D (Optional)
- Reskinned Rebreather (Lambda HEV Rebreather)
- Item can only be added with the console: player.additem XX000ADD 1 
(Where XX equals the load order of the mod)

V1.0E (Optional)
- Retextured Arcade Gannon's outfit to look more like Black Mesa scientist

V1.0F (Coming Soon)
- Black Mesa Security Uniform

V1.0G (Optional) 
- Military Grunt Gear - H.E.C.U - Hazardous Environment Combat Unit
- In a locker in Doc Mitchell's house
- Thanks to antistar for his Dragonskin Tactical Outfits and modding advice.
- Thanks to EspionageDB7 for the H.E.C.U. Patch Vector Art
V1.1G
- Correctly rigged helmets to head
- Added Left Hand Glove item for player to cover pip-boy glove
- Stats are the roughly the same as Dragonskin Tactical Armor, give or take. A little better than Combat Armor.
V1.1G - Fix
- Adds transparency to the gas mask lenses.

V1.1
- All-in-one download pack, plus placing items in the world via a locker in Doc Mitchell's house.