300 points on three models for 3d3 S9 shots. Range shouldn't be an issue- they are on jet bikes.
Or you take the much cheaper Adrathic Devastator, S6, Instant Death, Armorbane, Gets Hot and have a guaranteed six shots every shooting phase.
Math Hammer Time:
BS 5 means misses only on a 1.
Corvis Las Pulser: 36", S 9
AP 2 Heavy d3
Adrathic Devastator: 18", S 6
AP 2, Heavy 2, Instant Death, Armorbane, Gets Hot
Range as noted shouldn't be an issue as they are on Jetbikes and can get anywhere on the board in one turn of moving. What could be an advantage is the Split Fire rule, enabling one of the CLP's to fire at something else across the table, while the
AD would have to shoot at something closer.
Both weapons add +1 to the Vehicle Damage Table, so that's nothing. Both are heavy and
AP 2.
CLP S 9 means Instant Death on T 4 and below, and generates a range of 10-15 for the vehicle penetration roll. Note, that's -1 vs. Flare Shields, so against a Spartan in the front, it's still going to take a roll of a 6 to glance it. From the side, 5's glance, 6 penetrates. Your average penetration roll will be 9+3=12. Needs only a 2 to wound anything with T 7 and below. That would mean your Primarchs and Machine Dudes.
AD: Always Instant Death, even against a multiwound Terminator or any toughness value target. May not seem like much, but could come in handy (Machine Dudes). Only strength 6, so toughness values become an issue. Could have difficulty wounding a high toughness target (Primarch's, Machine Dudes). Vs. Armor things get very interesting. It has Armorbane. This generates a spread of 8-18, or -1 vs. flare shields so 7-17. The average roll will be 6+7=13. That's on average. Slightly above average and you are glancing
AV 14. The odds of a penetrating hit go WAY up vs. the CLP. If you look at the bell curves, mean, and standard deviation vs.
AV 14.
The
AD is a much better weapon for cracking armor. Even for lower
AV's, it's still better.
You always have six shots with the
AD. The CLP will average 6 shots, but most likely you will see something like 5-7. And sometimes only 3, or 9. That's hard to plan for and use Split Fire with as you have to decide your targets before you roll the dice. You might get only 1 shot at the side of a Spartan, and 6 shots at the rear of a Rhino.
A note about misses: 1 out of every 6 shots of the
AD will be a miss and an overheat. One out of every six armor saves will result in a single wound. So the probability is 0.028 chance of taking a wound due to overheat with the
AD. The CLP is twin-linked, which means you have a 0.028 chance of missing with the CLP, and if it does miss, nothing happens. You missed.
For Armor Cracking: The Adrathic Devastator is the way to go. It costs 1/5 the points of the CLP, has 1/2 the range, but can more easily damage high
AV targets on average rolls. The range isn't an issue as you are on a Jetbike and can easily move around on the table to get the best angles and the range required. You have about a 3% chance of missing and causing a wound on the firing model. The fixed number of shots makes it easier to plan Split Fire.
For Killing Dudes: It's hard to argue with a S 9
AP 2 shot that can basically wound anything on a 2+. You only have about a 3% chance of ever missing with the CLP, but you are randomly generating 3-9 shots a turn. This makes it considerably harder to plan for Split Fire, and the potential for overshoots increases. The range is very nice- enabling you to sit in the back and lob shots across the board.
Cost: You are paying 5 times more points for one CLP vs. one
AD. For the price of outfitting all three jetbikes with CLP, you could add another jetbike.
Final Analysis This unit is already a very high points cost unit for only 3 models. Adding more points for CLP at the cost of an extra jetbike is too much. The obvious choice here is the Adrathic Devastator. Plus, rule of cool. Who else gets to use an Adrathic Devastator? Las is everywhere! Heck, even an Imperial Guardsman has a Las gun! Plus, it's fun saying "Adrathic Devastator". Corvae Las-pulser sounds dumb.